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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 163 records · Page 9
All sourcesNASA NTRSDOE OSTI
DOE OSTI2019

Materials Data on KH6F12 by Materials Project

KH4F10(HF)2 crystallizes in the monoclinic C2/c space group. The structure is zero-dimensional and consists of eight hydrofluoric acid molecules and four KH4F10 clusters. In each KH4F10 cluster, K is bonded in a distorted square co-planar geometry to eight F atoms. There are a spread of K–F bond distances ranging from 2.57–3.23 Å. There are two inequivalent H sites. In the first H site, H is bonded in a linear geometry to two F atoms. There is one shorter (1.11 Å) and one longer (1.18 Å) H–F bond length. In the second H site, H is bonded in a single-bond geometry to one F atom. The H–F bond length is 0.94 Å. There are five inequivalent F sites. In the first F site, F is bonded in a distorted bent 120 degrees geometry to one K and one H atom. In the second F site, F is bonded in a distorted single-bond geometry to one K and one F atom. The F–F bond length is 1.43 Å. In the third F site, F is bonded in an L-shaped geometry to one K and one F atom. In the fourth F site, F is bonded in a single-bond geometry to one H atom. In the fifth F site, F is bonded in a distorted bent 150 degrees geometry to one K and one H atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HgF3 by Materials Project

(HgF2)2F2 is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional and consists of four hydrofluoric acid molecules and one HgF2 framework. In the HgF2 framework, Hg is bonded in a body-centered cubic geometry to eight equivalent F atoms. All Hg–F bond lengths are 2.48 Å. F is bonded to four equivalent Hg atoms to form a mixture of edge and corner-sharing FHg4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KF5 by Materials Project

(KF4)2F2 crystallizes in the tetragonal I4_1/a space group. The structure is three-dimensional and consists of four hydrofluoric acid molecules and one KF4 framework. In the KF4 framework, K is bonded in a 8-coordinate geometry to eight equivalent F atoms. There are four shorter (2.69 Å) and four longer (2.74 Å) K–F bond lengths. F is bonded in a water-like geometry to two equivalent K atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2019

Materials Data on ZrN3F7 by Materials Project

(Zr(NF2)3)2F2 crystallizes in the cubic Pn-3m space group. The structure is three-dimensional and consists of four hydrofluoric acid molecules and one Zr(NF2)3 framework. In the Zr(NF2)3 framework, Zr4+ is bonded in an octahedral geometry to six equivalent F1- atoms. All Zr–F bond lengths are 2.04 Å. N1+ is bonded in a linear geometry to two equivalent F1- atoms. Both N–F bond lengths are 1.77 Å. F1- is bonded in a bent 150 degrees geometry to one Zr4+ and one N1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2019

Materials Data on CdH20N6OF2 by Materials Project

Cd(NH3)6H2OF2 crystallizes in the trigonal P3_121 space group. The structure is zero-dimensional and consists of six hydrofluoric acid molecules, three water molecules, and three Cd(NH3)6 clusters. In each Cd(NH3)6 cluster, Cd2+ is bonded in an octahedral geometry to six N3- atoms. There are two shorter (2.38 Å) and four longer (2.43 Å) Cd–N bond lengths. There are three inequivalent N3- sites. In the first N3- site, N3- is bonded in a trigonal non-coplanar geometry to one Cd2+ and three H1+ atoms. There is one shorter (1.02 Å) and two longer (1.03 Å) N–H bond length. In the second N3- site, N3- is bonded in a trigonal non-coplanar geometry to one Cd2+ and three H1+ atoms. There is one shorter (1.02 Å) and two longer (1.03 Å) N–H bond length. In the third N3- site, N3- is bonded in a trigonal non-coplanar geometry to one Cd2+ and three H1+ atoms. There is one shorter (1.02 Å) and two longer (1.03 Å) N–H bond length. There are nine inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the third H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the sixth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the seventh H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the eighth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the ninth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NF by Materials Project

N2F2 crystallizes in the trigonal R-3m space group. The structure is zero-dimensional and consists of six hydrofluoric acid molecules and three nitrogen molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2018

Materials Data on TiH12N3F7 by Materials Project

(NH4)3TiF7 crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of one hydrofluoric acid molecule, one hydrogen molecule, one monofluoroamine molecule, one FH3 cluster, one NH4F cluster, and one TiNH2F3 cluster. In the FH3 cluster, there are three inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in an L-shaped geometry to two H1+ atoms. There are one shorter (0.84 Å) and one longer (1.15 Å) H–H bond lengths. In the second H1+ site, H1+ is bonded in a distorted single-bond geometry to one H1+ and one F1- atom. The H–F bond length is 1.17 Å. In the third H1+ site, H1+ is bonded in a single-bond geometry to one H1+ atom. F1- is bonded in a single-bond geometry to one H1+ atom. In the NH4F cluster, N3- is bonded in a 3-coordinate geometry to three H1+ atoms. There are a spread of N–H bond distances ranging from 0.91–1.22 Å. There are four inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N3- and one F1- atom. The H–F bond length is 1.63 Å. In the third H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one F1- atom. The H–F bond length is 1.61 Å. F1- is bonded in a 2-coordinate geometry to two H1+ atoms. In the TiNH2F3 cluster, Ti4+ is bonded in a 1-coordinate geometry to one N3- and two F1- atoms. The Ti–N bond length is 1.44 Å. There is one shorter (1.50 Å) and one longer (2.40 Å) Ti–F bond length. N3- is bonded in a 2-coordinate geometry to one Ti4+, one H1+, and one F1- atom. The N–H bond length is 0.71 Å. The N–F bond length is 1.75 Å. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a linear geometry to two F1- atoms. There is one shorter (0.75 Å) and one longer (1.33 Å) H–F bond length. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one Ti4+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to one H1+ atom. In the third F1- site, F1- is bonded in a distorted water-like geometry to one Ti4+, one N3-, and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cr3B7O13F by Materials Project

(Cr3B7O13)2F2 crystallizes in the cubic F-43c space group. The structure is three-dimensional and consists of eight hydrofluoric acid molecules and one Cr3B7O13 framework. In the Cr3B7O13 framework, Cr2+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Cr–O bond lengths are 2.08 Å. There are two inequivalent B3+ sites. In the first B3+ site, B3+ is bonded to four equivalent O2- atoms to form corner-sharing BO4 tetrahedra. All B–O bond lengths are 1.47 Å. In the second B3+ site, B3+ is bonded to four O2- atoms to form corner-sharing BO4 tetrahedra. There is three shorter (1.44 Å) and one longer (1.69 Å) B–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a tetrahedral geometry to four equivalent B3+ atoms. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to one Cr2+ and two B3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SbH5(O2F3)2 by Materials Project

H2(H3O2)2(H2O2)6(SbF4)4(F2)4 crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of four hydrofluoric acid molecules, one hydrogen molecule, two hydrogen peroxide molecules, two water molecules, one H3O2 cluster, and two SbF4 clusters. In the H3O2 cluster, there are three inequivalent H sites. In the first H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.61 Å. In the second H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.63 Å. In the third H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.26 Å) and one longer (1.30 Å) H–O bond length. There are two inequivalent O sites. In the first O site, O is bonded in a 2-coordinate geometry to two H atoms. In the second O site, O is bonded in a 1-coordinate geometry to two H atoms. In each SbF4 cluster, Sb is bonded in a 2-coordinate geometry to four F atoms. There are a spread of Sb–F bond distances ranging from 1.77–2.30 Å. There are four inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one Sb atom. In the second F site, F is bonded in a single-bond geometry to one Sb atom. In the third F site, F is bonded in a single-bond geometry to one Sb atom. In the fourth F site, F is bonded in a single-bond geometry to one Sb atom.

36 MATERIALS SCIENCE↗
DOE OSTI2019

Materials Data on CuPbF6 by Materials Project

CuPbF4F2 crystallizes in the triclinic P-1 space group. The structure is one-dimensional and consists of two hydrofluoric acid molecules and one CuPbF4 ribbon oriented in the (1, 1, 1) direction. In the CuPbF4 ribbon, Cu2+ is bonded in a square co-planar geometry to four F1- atoms. There is two shorter (1.93 Å) and two longer (1.95 Å) Cu–F bond length. Pb4+ is bonded in a linear geometry to two equivalent F1- atoms. Both Pb–F bond lengths are 1.25 Å. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one Cu2+ atom. In the second F1- site, F1- is bonded in a distorted bent 150 degrees geometry to one Cu2+ and one Pb4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2019

Materials Data on Rb5Mo3O3F14 by Materials Project

(Rb30Mo18O18F83)2F2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional and consists of one hydrofluoric acid molecule and one Rb30Mo18O18F83 framework. In the Rb30Mo18O18F83 framework, there are five inequivalent Rb1+ sites. In the first Rb1+ site, Rb1+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of Rb–F bond distances ranging from 2.82–3.01 Å. In the second Rb1+ site, Rb1+ is bonded in a 12-coordinate geometry to ten F1- atoms. There are a spread of Rb–F bond distances ranging from 2.91–3.16 Å. In the third Rb1+ site, Rb1+ is bonded in a 3-coordinate geometry to one O2- and seven F1- atoms. The Rb–O bond length is 2.89 Å. There are a spread of Rb–F bond distances ranging from 2.78–3.47 Å. In the fourth Rb1+ site, Rb1+ is bonded in a 10-coordinate geometry to three O2- and seven F1- atoms. There are one shorter (3.07 Å) and two longer (3.51 Å) Rb–O bond lengths. There are a spread of Rb–F bond distances ranging from 2.79–3.43 Å. In the fifth Rb1+ site, Rb1+ is bonded in a 7-coordinate geometry to three O2- and seven F1- atoms. There are one shorter (3.18 Å) and two longer (3.55 Å) Rb–O bond lengths. There are a spread of Rb–F bond distances ranging from 3.01–3.38 Å. There are three inequivalent Mo5+ sites. In the first Mo5+ site, Mo5+ is bonded to one O2- and five F1- atoms to form distorted corner-sharing MoOF5 octahedra. The corner-sharing octahedral tilt angles are 15°. The Mo–O bond length is 1.72 Å. There are a spread of Mo–F bond distances ranging from 1.98–2.22 Å. In the second Mo5+ site, Mo5+ is bonded to one O2- and five F1- atoms to form distorted corner-sharing MoOF5 octahedra. The corner-sharing octahedral tilt angles are 15°. The Mo–O bond length is 1.72 Å. There are a spread of Mo–F bond distances ranging from 1.99–2.19 Å. In the third Mo5+ site, Mo5+ is bonded to one O2- and five F1- atoms to form distorted corner-sharing MoOF5 octahedra. The corner-sharing octahedral tilt angles are 0°. The Mo–O bond length is 1.71 Å. There are four shorter (1.99 Å) and one longer (2.19 Å) Mo–F bond lengths. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to three Rb1+ and one Mo5+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to one Rb1+ and one Mo5+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to three Rb1+ and one Mo5+ atom. There are nine inequivalent F1- sites. In the first F1- site, F1- is bonded in a 1-coordinate geometry to three Rb1+ and one Mo5+ atom. In the second F1- site, F1- is bonded in a 1-coordinate geometry to three Rb1+ and one Mo5+ atom. In the third F1- site, F1- is bonded in a 1-coordinate geometry to three Rb1+ and one Mo5+ atom. In the fourth F1- site, F1- is bonded in a 1-coordinate geometry to three Rb1+ and one Mo5+ atom. In the fifth F1- site, F1- is bonded in a 1-coordinate geometry to three Rb1+ and one Mo5+ atom. In the sixth F1- site, F1- is bonded in a linear geometry to two equivalent Rb1+ and two equivalent Mo5+ atoms. In the seventh F1- site, F1- is bonded in a distorted single-bond geometry to three Rb1+ and one Mo5+ atom. In the eighth F1- site, F1- is bonded in a trigonal non-coplanar geometry to three equivalent Rb1+ atoms. In the ninth F1- site, F1- is bonded in a distorted linear geometry to one Rb1+ and two Mo5+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on InH3F3 by Materials Project

(InF)2H2(HF)4 is Cyanogen Chloride-like structured and crystallizes in the monoclinic P2/c space group. The structure is one-dimensional and consists of four hydrofluoric acid molecules; two hydrogen molecules; and two InF ribbons oriented in the (0, 1, 0) direction. In each InF ribbon, In2+ is bonded in a linear geometry to two equivalent F1- atoms. There are one shorter (2.27 Å) and one longer (2.35 Å) In–F bond lengths. F1- is bonded in a linear geometry to two equivalent In2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TiCuNO4F7 by Materials Project

(TiCu(O2F3)2)2N2F2 crystallizes in the tetragonal P4/n space group. The structure is zero-dimensional and consists of two ammonia molecules, two hydrofluoric acid molecules, and two TiCu(O2F3)2 clusters. In each TiCu(O2F3)2 cluster, Ti is bonded to six F atoms to form TiF6 octahedra that share a cornercorner with one CuO4F square pyramid. There are a spread of Ti–F bond distances ranging from 1.85–1.91 Å. Cu is bonded to four equivalent O and one F atom to form distorted CuO4F square pyramids that share a cornercorner with one TiF6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Cu–O bond lengths are 1.81 Å. The Cu–F bond length is 2.31 Å. O is bonded in a single-bond geometry to one Cu atom. There are three inequivalent F sites. In the first F site, F is bonded in a linear geometry to one Ti and one Cu atom. In the second F site, F is bonded in a single-bond geometry to one Ti atom. In the third F site, F is bonded in a single-bond geometry to one Ti atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on H7N2F by Materials Project

(NH4)2(NH3)2F2 crystallizes in the orthorhombic Pca2_1 space group. The structure is zero-dimensional and consists of four ammonia molecules, four ammonium molecules, and four hydrofluoric acid molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KCa4Si8H16O28F by Materials Project

(KCa4Si8(H4O7)4)2F2 crystallizes in the tetragonal P4/mnc space group. The structure is three-dimensional and consists of two hydrofluoric acid molecules and one KCa4Si8(H4O7)4 framework. In the KCa4Si8(H4O7)4 framework, K1+ is bonded in a body-centered cubic geometry to eight equivalent O2- atoms. All K–O bond lengths are 2.71 Å. Ca2+ is bonded in a 2-coordinate geometry to two equivalent H1+ and four O2- atoms. Both Ca–H bond lengths are 2.42 Å. There are two shorter (2.19 Å) and two longer (2.60 Å) Ca–O bond lengths. Si4+ is bonded to five O2- atoms to form distorted corner-sharing SiO5 trigonal bipyramids. There are a spread of Si–O bond distances ranging from 1.62–1.92 Å. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. In the second H1+ site, H1+ is bonded in a distorted single-bond geometry to one Ca2+ and one H1+ atom. The H–H bond length is 0.76 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Ca2+, and one Si4+ atom. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Si4+ atoms. In the third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Si4+ atoms. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to one Ca2+, one Si4+, and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Te4N5F21 by Materials Project

(N2)5(TeF5)8F2 crystallizes in the tetragonal P-42_1c space group. The structure is zero-dimensional and consists of ten ammonia molecules, two hydrofluoric acid molecules, and eight TeF5 clusters. In each TeF5 cluster, Te5+ is bonded in a square pyramidal geometry to five F1- atoms. There are a spread of Te–F bond distances ranging from 1.85–1.95 Å. There are five inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one Te5+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to one Te5+ atom. In the third F1- site, F1- is bonded in a single-bond geometry to one Te5+ atom. In the fourth F1- site, F1- is bonded in a single-bond geometry to one Te5+ atom. In the fifth F1- site, F1- is bonded in a single-bond geometry to one Te5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sc(NF2)3 by Materials Project

(ScF3)2N2(NF)4F2 crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of one ammonia molecule, one hydrofluoric acid molecule, two monofluoroamine molecules, and one scandium fluoride molecule.

36 MATERIALS SCIENCE↗
DOE OSTI2013

Normetex Pump Alternatives Study

A mainstay pump for tritium systems, the Normetex scroll pump, is currently unavailable because the Normetex company went out of business. This pump was an all-metal scroll pump that served tritium processing facilities very well. Current tritium system operators are evaluating replacement pumps for the Normetex pump and for general used in tritium service. An all-metal equivalent alternative to the Normetex pump has not yet been identified. 1. The ideal replacement tritium pump would be hermetically sealed and contain no polymer components or oils. Polymers and oils degrade over time when they contact ionizing radiation. 2. Halogenated polymers (containing fluorine, chlorine, or both) and oils are commonly found in pumps. These materials have many properties that surpass those of hydrocarbon-based polymers and oils, including thermal stability (higher operating temperature) and better chemical resistance. Unfortunately, they are less resistant to degradation from ionizing radiation than hydrocarbon-based materials (in general). 3. Polymers and oils can form gaseous, condensable (HF, TF), liquid, and solid species when exposed to ionizing radiation. For example, halogenated polymers form HF and HCl, which are extremely corrosive upon reaction with water. If a pump containing polymers or oils must be used in a tritium system, the system must be designed to be able to process the unwanted by-products. Design features to mitigate degradation products include filters and chemical or physical traps (eg. cold traps, oil traps). 4. Polymer components can work in tritium systems, but must be replaced regularly. Polymer components performance should be monitored or be regularly tested, and regular replacement of components should be viewed as an expected normal event. A radioactive waste stream must be established to dispose of used polymer components and oil with an approved disposal plan developed based on the facility location and its regulators. Polymers have varying resistances to ionizing radiation - aromatic polymers such as polyimide Vespel (TM) and the elastomer EPDM (ethylene propylene diene monomer) have been found to be more resistant to degradation in tritium than other polymers. This report presents information to help select replacement pumps for Normetex pumps in tritium systems. Several pumps being considered as Normetex replacement pumps are discussed.

07 ISOTOPE AND RADIATION SOURCES↗