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At least 199 records · Page 11
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ag2Hg7(P4Br3)2 by Materials Project

Ag2Hg7(P4Br3)2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Ag1+ is bonded to two equivalent P1- and four Br1- atoms to form AgP2Br4 octahedra that share corners with two equivalent AgP2Br4 octahedra, corners with two equivalent HgP2Br4 octahedra, corners with two equivalent PHg2P2 tetrahedra, and corners with two equivalent PAgHgP2 trigonal pyramids. The corner-sharing octahedral tilt angles are 52°. Both Ag–P bond lengths are 2.63 Å. There are two shorter (2.98 Å) and two longer (3.09 Å) Ag–Br bond lengths. There are three inequivalent Hg+1.71+ sites. In the first Hg+1.71+ site, Hg+1.71+ is bonded in a 7-coordinate geometry to two P1- and four Br1- atoms. There are one shorter (2.45 Å) and one longer (2.46 Å) Hg–P bond lengths. There are a spread of Hg–Br bond distances ranging from 3.19–3.67 Å. In the second Hg+1.71+ site, Hg+1.71+ is bonded in a 5-coordinate geometry to two P1- and three Br1- atoms. There are one shorter (2.44 Å) and one longer (2.46 Å) Hg–P bond lengths. There are one shorter (3.07 Å) and two longer (3.40 Å) Hg–Br bond lengths. In the third Hg+1.71+ site, Hg+1.71+ is bonded to two equivalent P1- and four equivalent Br1- atoms to form HgP2Br4 octahedra that share corners with four equivalent AgP2Br4 octahedra and corners with four equivalent PAgHgP2 trigonal pyramids. The corner-sharing octahedral tilt angles are 52°. Both Hg–P bond lengths are 2.59 Å. All Hg–Br bond lengths are 3.15 Å. There are three inequivalent P1- sites. In the first P1- site, P1- is bonded to one Ag1+, one Hg+1.71+, and two P1- atoms to form PAgHgP2 trigonal pyramids that share a cornercorner with one AgP2Br4 octahedra, a cornercorner with one HgP2Br4 octahedra, corners with two PHg2P2 tetrahedra, and corners with two equivalent PAgHgP2 trigonal pyramids. The corner-sharing octahedra tilt angles range from 52–57°. There are one shorter (2.22 Å) and one longer (2.24 Å) P–P bond lengths. In the second P1- site, P1- is bonded to two Hg+1.71+ and two equivalent P1- atoms to form distorted PHg2P2 tetrahedra that share corners with two equivalent AgP2Br4 octahedra, corners with two PHg2P2 tetrahedra, and corners with two equivalent PAgHgP2 trigonal pyramids. The corner-sharing octahedral tilt angles are 58°. In the third P1- site, P1- is bonded to three Hg+1.71+ and one P1- atom to form PHg3P tetrahedra that share a cornercorner with one PHg2P2 tetrahedra and corners with two equivalent PAgHgP2 trigonal pyramids. The P–P bond length is 2.17 Å. There are two inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 5-coordinate geometry to one Ag1+ and four Hg+1.71+ atoms. In the second Br1- site, Br1- is bonded in a 7-coordinate geometry to two equivalent Ag1+ and five Hg+1.71+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2022

Diel mercury concentration variations in a mercury-impacted stream

Here, filtered and particulate mercury (Hg) and methylmercury (MMHg), and associated water chemistry parameters, were evaluated bi-hourly for several 30 h periods during the summer and winter seasons at several distinct locations (downstream forested, midstream urban/suburban, upstream industrial) along a creek contaminated with high levels of inorganic Hg to determine if biogeochemical Hg and MMHg cycles respond to the daily photocycle. In summer particulate Hg and MMHg concentrations doubled overnight (excluding the upstream industrial site) concurrent with increases in turbidity and total suspended sediment; no such pattern was evident in winter. Seasonal and diel changes in the activity of macrobiota affecting the suspension of contaminated sediments are likely responsible for these patterns as other potential explanatory variables (e.g., instrument drift, pH, discharge) could not account for the range and timing of our observations. Diel patterns in filtered Hg (Hg D ) were significant only at locations and times of the year when channel shading was not present and daytime concentrations increased 22–89% above nighttime minima likely caused by direct and indirect photochemical reactions. Relationships between Hg D and dissolved organic carbon (DOC) concentration or character were inconsistent between sites. Unlike Hg D , there were significant diel patterns in filtered MMHg (MMHg D ) at all sites and times of year, with summer concentrations peaking in mid to late afternoon while the timing differed in winter, with concentrations peaking after sunset. Daily variability in MMHg D concentration ranged between 25 and 75%. The results imply key controls on net methylation occur within the stream or on the stream bed and include factors such as small-scale temperature changes in the water column and photosynthetic activity of stream biofilm. With respect to stream monitoring, results from this study indicate (1) consistent timing in stream Hg and MMHg sampling is required for accurate assessment of long-term trends, (2) in situ measurements of turbidity can be used to quantify diel dynamics of both particulate Hg and MMHg concentrations, and (3) in situ fluorescing dissolved organic matter (FDOM), a potential proxy for DOC, was not capable of resolving diel dynamics of filtered Hg or MMHg.

54 ENVIRONMENTAL SCIENCES↗
DOE OSTI2020

Materials Data on HgTe2C2(NF8)2 by Materials Project

HgC2Te2(NF8)2 crystallizes in the orthorhombic Pbca space group. The structure is zero-dimensional and consists of four HgC2Te2(NF8)2 clusters. Hg2+ is bonded in a distorted linear geometry to two equivalent N3- atoms. Both Hg–N bond lengths are 2.07 Å. C4+ is bonded to one N3- and three F1- atoms to form CNF3 tetrahedra that share a cornercorner with one TeNF5 octahedra. The corner-sharing octahedral tilt angles are 59°. The C–N bond length is 1.41 Å. There is two shorter (1.36 Å) and one longer (1.38 Å) C–F bond length. N3- is bonded in a distorted trigonal planar geometry to one Hg2+, one C4+, and one Te6+ atom. The N–Te bond length is 1.98 Å. Te6+ is bonded to one N3- and five F1- atoms to form TeNF5 octahedra that share a cornercorner with one CNF3 tetrahedra. There is three shorter (1.88 Å) and two longer (1.89 Å) Te–F bond length. There are eight inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one C4+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to one Te6+ atom. In the third F1- site, F1- is bonded in a single-bond geometry to one Te6+ atom. In the fourth F1- site, F1- is bonded in a single-bond geometry to one C4+ atom. In the fifth F1- site, F1- is bonded in a single-bond geometry to one Te6+ atom. In the sixth F1- site, F1- is bonded in a single-bond geometry to one Te6+ atom. In the seventh F1- site, F1- is bonded in a single-bond geometry to one Te6+ atom. In the eighth F1- site, F1- is bonded in a single-bond geometry to one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Analysis of alternative climate datasets and evapotranspiration methods for the Upper Mississippi River Basin using SWAT within HAWQS

This study reports the application of Soil andWater Assessment Tool (SWAT) within the Hydrologic andWater Quality System(HAWQS) on-line platform, for the UpperMississippi River Basin (UMRB). TheUMRB is an important ecosystem located in the north central U.S. that is experiencing a range of ecological stresses. Specifically, testing of SWAT was performed for: (1) Hargreaves (HG) and Penman-Monteith (PM) PET methods, and (2) Livneh, National Climatic Data Center (NCDC) and Parameter-elevation Regressions on Independent Slopes Model (PRISM) climate datasets. The Livneh-PM combination resulted in the highest average annual water yield of 380.6 mm versus the lowest estimated water yield of 193.9 mm for the Livneh-HG combination, in response to 23-year uncalibrated simulations. Higher annual ET and PET values were predicted with HG method versus the PM method for all three weather datasets in response to the uncalibrated simulations, due primarily to higher HG-based estimates during the growing season. Based on these results, it was found that the HG method is the preferred PET option for the UMRB. Initial calibration of SWAT was performed using the Livneh data and HGmethod for threeMississippi Rivermain stem gauge sites, which was followed by spatial validation at 10 other gauge sites located within the UMRB streamnetwork. Overall satisfactory results were found for the calibration and validation gauge sites, with the majority of R2 values ranging between 0.61 and 0.82, Nash- Sutcliffe modeling efficiency (NSE) values ranging between 0.50 and 0.79, and Kling-Gupta efficiency (KGE) values ranging between 0.61 and 0.84. The results of an additional experimental suite of six scenarios,which represented different combinations of climate data sets and calibrated parameters, revealed that suggested statistical criteria were again satisfied by the different scenario combinations. Overall, the PRISM data exhibited the strongest reliability for the UMRB.

54 ENVIRONMENTAL SCIENCES↗
DOE OSTI2020

Materials Data on Ag8Hg(AsO5)2 by Materials Project

Ag8Hg(AsO5)2 crystallizes in the trigonal P31c space group. The structure is three-dimensional. there are four inequivalent Ag1+ sites. In the first Ag1+ site, Ag1+ is bonded in a 3-coordinate geometry to three O2- atoms. There are a spread of Ag–O bond distances ranging from 2.29–2.47 Å. In the second Ag1+ site, Ag1+ is bonded in a 3-coordinate geometry to three equivalent O2- atoms. All Ag–O bond lengths are 2.29 Å. In the third Ag1+ site, Ag1+ is bonded in a 3-coordinate geometry to three equivalent O2- atoms. All Ag–O bond lengths are 2.31 Å. In the fourth Ag1+ site, Ag1+ is bonded in a distorted trigonal non-coplanar geometry to three O2- atoms. There are one shorter (2.26 Å) and two longer (2.37 Å) Ag–O bond lengths. Hg2+ is bonded in a linear geometry to two O2- atoms. There are one shorter (2.07 Å) and one longer (2.10 Å) Hg–O bond lengths. There are two inequivalent As5+ sites. In the first As5+ site, As5+ is bonded in a tetrahedral geometry to four O2- atoms. There is three shorter (1.72 Å) and one longer (1.76 Å) As–O bond length. In the second As5+ site, As5+ is bonded in a tetrahedral geometry to four O2- atoms. There is one shorter (1.73 Å) and three longer (1.74 Å) As–O bond length. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded to three equivalent Ag1+ and one As5+ atom to form distorted corner-sharing OAg3As tetrahedra. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ag1+ and one As5+ atom. In the third O2- site, O2- is bonded to three equivalent Ag1+ and one Hg2+ atom to form corner-sharing OAg3Hg tetrahedra. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ag1+ and one As5+ atom. In the fifth O2- site, O2- is bonded to three equivalent Ag1+ and one Hg2+ atom to form corner-sharing OAg3Hg tetrahedra. In the sixth O2- site, O2- is bonded to three equivalent Ag1+ and one As5+ atom to form distorted corner-sharing OAg3As tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba2GdCu2(HgO4)2 by Materials Project

Ba2GdCu2(HgO4)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.68–3.00 Å. Gd3+ is bonded in a body-centered cubic geometry to eight equivalent O2- atoms. All Gd–O bond lengths are 2.45 Å. Cu+2.50+ is bonded to five O2- atoms to form CuO5 square pyramids that share a cornercorner with one HgO6 octahedra and corners with four equivalent CuO5 square pyramids. The corner-sharing octahedral tilt angles are 0°. There are four shorter (1.96 Å) and one longer (2.46 Å) Cu–O bond lengths. Hg2+ is bonded to six O2- atoms to form distorted HgO6 octahedra that share corners with four equivalent HgO6 octahedra, a cornercorner with one CuO5 square pyramid, and edges with eight equivalent HgO6 octahedra. The corner-sharing octahedral tilt angles are 8°. There are a spread of Hg–O bond distances ranging from 2.08–2.77 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 6-coordinate geometry to two equivalent Ba2+, two equivalent Gd3+, and two equivalent Cu+2.50+ atoms. In the second O2- site, O2- is bonded to one Ba2+ and five equivalent Hg2+ atoms to form a mixture of distorted edge and corner-sharing OBaHg5 octahedra. The corner-sharing octahedra tilt angles range from 0–8°. In the third O2- site, O2- is bonded to four equivalent Ba2+, one Cu+2.50+, and one Hg2+ atom to form a mixture of distorted edge and corner-sharing OBa4CuHg octahedra. The corner-sharing octahedra tilt angles range from 0–16°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg3(SeI)2 by Materials Project

Hg3Se2I2 crystallizes in the orthorhombic Imma space group. The structure is three-dimensional. there are three inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded in a 4-coordinate geometry to two equivalent Se2- and two equivalent I1- atoms. Both Hg–Se bond lengths are 2.60 Å. Both Hg–I bond lengths are 3.19 Å. In the second Hg2+ site, Hg2+ is bonded in a 6-coordinate geometry to two equivalent Se2- and four I1- atoms. Both Hg–Se bond lengths are 2.57 Å. There are a spread of Hg–I bond distances ranging from 3.19–3.83 Å. In the third Hg2+ site, Hg2+ is bonded in a 5-coordinate geometry to two equivalent Se2- and three I1- atoms. Both Hg–Se bond lengths are 2.59 Å. There are a spread of Hg–I bond distances ranging from 3.12–3.82 Å. Se2- is bonded in a 3-coordinate geometry to three Hg2+ atoms. There are three inequivalent I1- sites. In the first I1- site, I1- is bonded in a 3-coordinate geometry to four Hg2+ atoms. In the second I1- site, I1- is bonded in a distorted L-shaped geometry to four equivalent Hg2+ atoms. In the third I1- site, I1- is bonded in a 4-coordinate geometry to six Hg2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba4CaCu6(HgO8)2 by Materials Project

Ba4CaCu6(HgO8)2 crystallizes in the orthorhombic Pmm2 space group. The structure is two-dimensional and consists of one Ba4CaCu6(HgO8)2 sheet oriented in the (0, 0, 1) direction. there are four inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ba–O bond distances ranging from 2.67–2.85 Å. In the second Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ba–O bond distances ranging from 2.67–2.84 Å. In the third Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ba–O bond distances ranging from 2.65–2.82 Å. In the fourth Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ba–O bond distances ranging from 2.58–2.85 Å. Ca2+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.35–2.46 Å. There are three inequivalent Cu3+ sites. In the first Cu3+ site, Cu3+ is bonded in a square co-planar geometry to four O2- atoms. All Cu–O bond lengths are 1.90 Å. In the second Cu3+ site, Cu3+ is bonded in a square co-planar geometry to four O2- atoms. There are a spread of Cu–O bond distances ranging from 1.82–1.96 Å. In the third Cu3+ site, Cu3+ is bonded in a square co-planar geometry to four O2- atoms. There are a spread of Cu–O bond distances ranging from 1.83–1.93 Å. Hg2+ is bonded in a linear geometry to two O2- atoms. Both Hg–O bond lengths are 2.00 Å. There are eleven inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted T-shaped geometry to one Ca2+ and two equivalent Cu3+ atoms. In the second O2- site, O2- is bonded in a distorted see-saw-like geometry to two equivalent Ca2+ and two equivalent Cu3+ atoms. In the third O2- site, O2- is bonded in a linear geometry to two equivalent Cu3+ atoms. In the fourth O2- site, O2- is bonded in a 5-coordinate geometry to four Ba2+ and one Hg2+ atom. In the fifth O2- site, O2- is bonded in a 5-coordinate geometry to four Ba2+ and one Hg2+ atom. In the sixth O2- site, O2- is bonded in a 5-coordinate geometry to two Ba2+, one Ca2+, and two equivalent Cu3+ atoms. In the seventh O2- site, O2- is bonded in a 4-coordinate geometry to two Ba2+ and two equivalent Cu3+ atoms. In the eighth O2- site, O2- is bonded in a 6-coordinate geometry to two equivalent Ba2+, two equivalent Ca2+, and two equivalent Cu3+ atoms. In the ninth O2- site, O2- is bonded to two equivalent Ba2+ and two equivalent Cu3+ atoms to form distorted corner-sharing OBa2Cu2 trigonal pyramids. In the tenth O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ba2+ and two equivalent Cu3+ atoms. In the eleventh O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ba2+ and two equivalent Cu3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SiHg3(SF3)2 by Materials Project

Hg3Si(SF3)2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Hg2+ is bonded in a distorted hexagonal planar geometry to two equivalent S2- and four equivalent F1- atoms. Both Hg–S bond lengths are 2.38 Å. All Hg–F bond lengths are 2.97 Å. Si4+ is bonded in an octahedral geometry to six equivalent F1- atoms. All Si–F bond lengths are 1.72 Å. S2- is bonded in a distorted hexagonal planar geometry to three equivalent Hg2+ and three equivalent F1- atoms. All S–F bond lengths are 2.89 Å. F1- is bonded in a single-bond geometry to two equivalent Hg2+, one Si4+, and one S2- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2022

Ligand removal energetics control CO 2 electroreduction selectivity on atomically precise, ligated alloy nanoclusters

Atomically precise, thiolate-protected gold nanoclusters (TPNCs) exhibit remarkable catalytic performance for the electrochemical reduction of carbon dioxide (CO 2 R) to CO. The origin of their high CO 2 R activity and selectivity has been attributed to partial ligand removal from the thiolate-covered surfaces of TPNCs to expose catalytically active sulfur atoms. Recently, heterometal doped (alloy) TPNCs have been shown to exhibit enhanced CO 2 R activity and selectivity compared to their monometallic counterparts. However, systematic studies on the effect of doping (metal type and location on TPNC) on active site exposure and CO 2 R activity are missing in literature. Herein, we apply Density Functional Theory calculations to investigate the effect of heterometal (Pt, Pd, Hg and Cd) doping of Au 25 (SR) 18 TPNC on the active site exposure and CO 2 R activity and selectivity. In this study, we reveal that doping significantly modifies relevant TPNC electronic properties, such as electron affinity, while also altering partial ligand removal and carboxyl (*COOH) intermediate formation energies. Furthermore, we demonstrate that changing the dopant (e.g. Hg) position can change the selectivity of the TPNC towards CO (g) or H 2(g) formation, highlighting the importance of dopant locations in TPNC-based CO 2 R. Most notably, we report a universal (i.e. capturing different dopant types and positions) linear trend between the ligand removal energy and i) the *COOH formation energy, as well as, ii) the hydrogen (*H) formation energy on the different alloy TPNCs. Thus, utilizing the ligand removal energy as a descriptor for CO 2 RR activity and selectivity, our work opens new avenues for accelerated computational screening of different alloy TPNCs for electrocatalytic CO 2 R applications.

54 ENVIRONMENTAL SCIENCES↗
DOE OSTI2020

Materials Data on Si(Hg2S3)2 by Materials Project

Hg4SiS6 is Chalcostibite-like structured and crystallizes in the monoclinic Cc space group. The structure is three-dimensional. there are four inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded in a 5-coordinate geometry to five S2- atoms. There are a spread of Hg–S bond distances ranging from 2.58–3.30 Å. In the second Hg2+ site, Hg2+ is bonded to four S2- atoms to form HgS4 tetrahedra that share corners with two equivalent HgS4 tetrahedra and corners with two equivalent SiS4 tetrahedra. There are a spread of Hg–S bond distances ranging from 2.57–2.68 Å. In the third Hg2+ site, Hg2+ is bonded to four S2- atoms to form HgS4 tetrahedra that share corners with two equivalent HgS4 tetrahedra and corners with two equivalent SiS4 tetrahedra. There are a spread of Hg–S bond distances ranging from 2.56–2.74 Å. In the fourth Hg2+ site, Hg2+ is bonded in a 4-coordinate geometry to four S2- atoms. There are a spread of Hg–S bond distances ranging from 2.56–2.70 Å. Si4+ is bonded to four S2- atoms to form SiS4 tetrahedra that share corners with four HgS4 tetrahedra. There are a spread of Si–S bond distances ranging from 2.12–2.16 Å. There are six inequivalent S2- sites. In the first S2- site, S2- is bonded to four Hg2+ atoms to form corner-sharing SHg4 tetrahedra. In the second S2- site, S2- is bonded in a distorted trigonal non-coplanar geometry to two Hg2+ and one Si4+ atom. In the third S2- site, S2- is bonded in a distorted trigonal non-coplanar geometry to two Hg2+ and one Si4+ atom. In the fourth S2- site, S2- is bonded in a 3-coordinate geometry to three Hg2+ and one Si4+ atom. In the fifth S2- site, S2- is bonded to four Hg2+ atoms to form corner-sharing SHg4 tetrahedra. In the sixth S2- site, S2- is bonded in a 3-coordinate geometry to two Hg2+ and one Si4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Si(Hg2Se3)2 by Materials Project

Hg4SiSe6 is Chalcostibite-like structured and crystallizes in the monoclinic Cc space group. The structure is three-dimensional. there are four inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded in a 5-coordinate geometry to five Se2- atoms. There are a spread of Hg–Se bond distances ranging from 2.71–3.49 Å. In the second Hg2+ site, Hg2+ is bonded to four Se2- atoms to form HgSe4 tetrahedra that share corners with two equivalent SiSe4 tetrahedra and corners with five HgSe4 tetrahedra. There are a spread of Hg–Se bond distances ranging from 2.66–2.83 Å. In the third Hg2+ site, Hg2+ is bonded to four Se2- atoms to form HgSe4 tetrahedra that share corners with two equivalent SiSe4 tetrahedra and corners with five HgSe4 tetrahedra. There are a spread of Hg–Se bond distances ranging from 2.69–2.85 Å. In the fourth Hg2+ site, Hg2+ is bonded to four Se2- atoms to form distorted HgSe4 tetrahedra that share corners with two equivalent SiSe4 tetrahedra and corners with six HgSe4 tetrahedra. There are a spread of Hg–Se bond distances ranging from 2.69–2.84 Å. Si4+ is bonded to four Se2- atoms to form SiSe4 tetrahedra that share corners with six HgSe4 tetrahedra. There are a spread of Si–Se bond distances ranging from 2.28–2.31 Å. There are six inequivalent Se2- sites. In the first Se2- site, Se2- is bonded to four Hg2+ atoms to form distorted corner-sharing SeHg4 trigonal pyramids. In the second Se2- site, Se2- is bonded in a distorted trigonal non-coplanar geometry to two Hg2+ and one Si4+ atom. In the third Se2- site, Se2- is bonded in a distorted trigonal non-coplanar geometry to two Hg2+ and one Si4+ atom. In the fourth Se2- site, Se2- is bonded in a 3-coordinate geometry to three Hg2+ and one Si4+ atom. In the fifth Se2- site, Se2- is bonded to four Hg2+ atoms to form corner-sharing SeHg4 tetrahedra. In the sixth Se2- site, Se2- is bonded in a 3-coordinate geometry to two Hg2+ and one Si4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg12SbBr(ClO3)2 by Materials Project

Hg12SbBr(O3Cl)2 crystallizes in the trigonal P3 space group. The structure is three-dimensional. there are twelve inequivalent Hg+1.50+ sites. In the first Hg+1.50+ site, Hg+1.50+ is bonded in a 1-coordinate geometry to two equivalent O2- and one Br1- atom. There are one shorter (2.27 Å) and one longer (2.66 Å) Hg–O bond lengths. The Hg–Br bond length is 3.13 Å. In the second Hg+1.50+ site, Hg+1.50+ is bonded in a 1-coordinate geometry to one Hg+1.50+, one O2-, and one Cl1- atom. The Hg–Hg bond length is 2.66 Å. The Hg–O bond length is 2.24 Å. The Hg–Cl bond length is 2.83 Å. In the third Hg+1.50+ site, Hg+1.50+ is bonded in a distorted single-bond geometry to one O2-, one Br1-, and one Cl1- atom. The Hg–O bond length is 2.25 Å. The Hg–Br bond length is 3.13 Å. The Hg–Cl bond length is 3.21 Å. In the fourth Hg+1.50+ site, Hg+1.50+ is bonded in a 1-coordinate geometry to one Hg+1.50+, one O2-, and one Cl1- atom. The Hg–Hg bond length is 2.65 Å. The Hg–O bond length is 2.28 Å. The Hg–Cl bond length is 2.79 Å. In the fifth Hg+1.50+ site, Hg+1.50+ is bonded in a single-bond geometry to one Hg+1.50+ and one O2- atom. The Hg–Hg bond length is 2.68 Å. The Hg–O bond length is 2.26 Å. In the sixth Hg+1.50+ site, Hg+1.50+ is bonded in a 4-coordinate geometry to one Hg+1.50+, two equivalent O2-, and one Br1- atom. There are one shorter (2.29 Å) and one longer (2.64 Å) Hg–O bond lengths. The Hg–Br bond length is 3.34 Å. In the seventh Hg+1.50+ site, Hg+1.50+ is bonded in a 1-coordinate geometry to one Hg+1.50+, one O2-, and one Cl1- atom. The Hg–Hg bond length is 2.68 Å. The Hg–O bond length is 2.28 Å. The Hg–Cl bond length is 2.81 Å. In the eighth Hg+1.50+ site, Hg+1.50+ is bonded in a 1-coordinate geometry to one O2- and one Cl1- atom. The Hg–O bond length is 2.25 Å. The Hg–Cl bond length is 2.84 Å. In the ninth Hg+1.50+ site, Hg+1.50+ is bonded in a single-bond geometry to one O2- atom. The Hg–O bond length is 2.23 Å. In the tenth Hg+1.50+ site, Hg+1.50+ is bonded in a 4-coordinate geometry to one Hg+1.50+, two equivalent O2-, and one Br1- atom. There are one shorter (2.33 Å) and one longer (2.61 Å) Hg–O bond lengths. The Hg–Br bond length is 3.37 Å. In the eleventh Hg+1.50+ site, Hg+1.50+ is bonded in a 1-coordinate geometry to one Hg+1.50+, two equivalent O2-, one Br1-, and one Cl1- atom. There are one shorter (2.25 Å) and one longer (2.74 Å) Hg–O bond lengths. The Hg–Br bond length is 3.39 Å. The Hg–Cl bond length is 3.32 Å. In the twelfth Hg+1.50+ site, Hg+1.50+ is bonded in a 1-coordinate geometry to one Hg+1.50+, two equivalent O2-, one Br1-, and one Cl1- atom. There are one shorter (2.30 Å) and one longer (2.70 Å) Hg–O bond lengths. The Hg–Br bond length is 3.07 Å. The Hg–Cl bond length is 3.50 Å. There are three inequivalent Sb3- sites. In the first Sb3- site, Sb3- is bonded in an octahedral geometry to six O2- atoms. There are three shorter (2.04 Å) and three longer (2.07 Å) Sb–O bond lengths. In the second Sb3- site, Sb3- is bonded in an octahedral geometry to six O2- atoms. All Sb–O bond lengths are 2.05 Å. In the third Sb3- site, Sb3- is bonded in an octahedral geometry to six O2- atoms. There are three shorter (2.04 Å) and three longer (2.07 Å) Sb–O bond lengths. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded to three Hg+1.50+ and one Sb3- atom to form distorted edge-sharing OHg3Sb tetrahedra. In the second O2- site, O2- is bonded in a 4-coordinate geometry to three Hg+1.50+ and one Sb3- atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to three Hg+1.50+ and one Sb3- atom. In the fourth O2- site, O2- is bonded to three Hg+1.50+ and one Sb3- atom to form distorted edge-sharing OHg3Sb tetrahedra. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to two Hg+1.50+ and one Sb3- atom. In the sixth O2- site, O2- is bonded to three Hg+1.50+ and one Sb3- atom to form distorted edge-sharing OHg3Sb tetrahedra. There are three inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 6-coordinate geometry to six Hg+1.50+ atoms. In the second Br1- site, Br1- is bonded in a 6-coordinate geometry to six Hg+1.50+ atoms. In the third Br1- site, Br1- is bonded in a 6-coordinate geometry to six Hg+1.50+ atoms. There are two inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a distorted bent 150 degrees geometry to three Hg+1.50+ atoms. In the second Cl1- site, Cl1- is bonded in a 4-coordinate geometry to four Hg+1.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg3(SeI)2 by Materials Project

Hg3Se2I2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are four inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded in a 4-coordinate geometry to two Se2- and four I1- atoms. There are one shorter (2.58 Å) and one longer (2.60 Å) Hg–Se bond lengths. There are a spread of Hg–I bond distances ranging from 3.17–3.93 Å. In the second Hg2+ site, Hg2+ is bonded in a 6-coordinate geometry to two equivalent Se2- and four I1- atoms. Both Hg–Se bond lengths are 2.57 Å. There are a spread of Hg–I bond distances ranging from 3.22–3.88 Å. In the third Hg2+ site, Hg2+ is bonded to two Se2- and four I1- atoms to form a mixture of distorted corner and edge-sharing HgSe2I4 octahedra. The corner-sharing octahedra tilt angles range from 0–4°. Both Hg–Se bond lengths are 2.57 Å. There are a spread of Hg–I bond distances ranging from 3.40–3.69 Å. In the fourth Hg2+ site, Hg2+ is bonded in a 4-coordinate geometry to two equivalent Se2- and two I1- atoms. Both Hg–Se bond lengths are 2.60 Å. There are one shorter (3.07 Å) and one longer (3.23 Å) Hg–I bond lengths. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 3-coordinate geometry to three Hg2+ atoms. In the second Se2- site, Se2- is bonded in a 3-coordinate geometry to three Hg2+ atoms. There are five inequivalent I1- sites. In the first I1- site, I1- is bonded in a 4-coordinate geometry to four Hg2+ atoms. In the second I1- site, I1- is bonded in a distorted trigonal non-coplanar geometry to three Hg2+ atoms. In the third I1- site, I1- is bonded in a 6-coordinate geometry to six Hg2+ atoms. In the fourth I1- site, I1- is bonded in a 8-coordinate geometry to eight Hg2+ atoms. In the fifth I1- site, I1- is bonded in a 4-coordinate geometry to ten Hg2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2021

Air Pathway Dose Modeling for the E-Area Low-Level Waste Facility

The US Department of Energy (DOE) Order 435.1 performance assessment (PA) process (USDOE 1999) prescribes a performance objective (10 mrem y -1 ) for evaluating atmospheric releases of radionuclides from DOE low-level waste (LLW) disposal facilities. The potential dose to an individual from exposure to radionuclides released into the atmosphere from LLW disposals can be estimated by application of radionuclide-specific dose-release factors (DRFs) (mrem Ci -1 ) to estimated flux rates (Ci y -1 ) at a particular time and location. In Revision 0 of this report, Lee (2006) calculated DRFs for potential atmospheric releases of 15 volatile radionuclides from seven ELLWF disposal units in support of the 2008 ELLWF PA (WSRC 2008). The mainframe version of the US Environmental Protection Agency’s (EPA) dose model CAP88 was used in the Revision 0 assessment. In Revision 1 of this report (Dixon and Minter 2017), the site-specific Savannah River National Laboratory (SRNL) atmospheric dose models MAXDOSE-SR version 2013 (Stone and Jannik 2013a) and MAXINE version 2017 (Bell 2017) were used to calculate DRFs for ten radionuclides. Revision 2 provided updated DRFs using the current version of the US Environmental Protection Agency’s (EPA) dose model CAP88-PC Version 4.1. After Revision 2 was finalized, DRFs were requested for Ar-37, Ar-39, Kr-83m, and Hg-206. Revision 3 provides the additional DRFs calculated using the same methods as used in Revision 2 of this document. The method for estimating new DRFs for the ELLWF disposal units is described in this report.

61 RADIATION PROTECTION AND DOSIMETRY↗
DOE OSTI2020

Materials Data on HgWO4 by Materials Project

HgWO4 crystallizes in the orthorhombic Cmce space group. The structure is three-dimensional. W6+ is bonded to six O2- atoms to form a mixture of distorted edge and corner-sharing WO6 pentagonal pyramids. There are a spread of W–O bond distances ranging from 1.81–2.07 Å. Hg2+ is bonded in a 2-coordinate geometry to seven O2- atoms. There are a spread of Hg–O bond distances ranging from 2.19–2.81 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent W6+ and three equivalent Hg2+ atoms. In the second O2- site, O2- is bonded in a trigonal non-coplanar geometry to one W6+ and two equivalent Hg2+ atoms. In the third O2- site, O2- is bonded in a water-like geometry to two equivalent W6+ atoms. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to one W6+ and two equivalent Hg2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CrHgF6 by Materials Project

CrHgF6 crystallizes in the trigonal R-3 space group. The structure is three-dimensional. Cr4+ is bonded to six equivalent F1- atoms to form CrF6 octahedra that share corners with six equivalent HgF6 octahedra. The corner-sharing octahedral tilt angles are 44°. All Cr–F bond lengths are 1.86 Å. Hg2+ is bonded to six equivalent F1- atoms to form HgF6 octahedra that share corners with six equivalent CrF6 octahedra. The corner-sharing octahedral tilt angles are 44°. All Hg–F bond lengths are 2.34 Å. F1- is bonded in a 2-coordinate geometry to one Cr4+ and one Hg2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sn(HgSe2)2 by Materials Project

Hg2SnSe4 crystallizes in the tetragonal I-4 space group. The structure is three-dimensional. there are two inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded to four equivalent Se2- atoms to form HgSe4 tetrahedra that share corners with four equivalent HgSe4 tetrahedra and corners with four equivalent SnSe4 tetrahedra. All Hg–Se bond lengths are 2.73 Å. In the second Hg2+ site, Hg2+ is bonded to four equivalent Se2- atoms to form HgSe4 tetrahedra that share corners with four equivalent HgSe4 tetrahedra and corners with four equivalent SnSe4 tetrahedra. All Hg–Se bond lengths are 2.73 Å. Sn4+ is bonded to four equivalent Se2- atoms to form SnSe4 tetrahedra that share corners with eight HgSe4 tetrahedra. All Sn–Se bond lengths are 2.59 Å. Se2- is bonded in a trigonal non-coplanar geometry to two Hg2+ and one Sn4+ atom.

36 MATERIALS SCIENCE↗