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At least 127 records · Page 7
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on TlCl3 by Materials Project

TlCl3 is alpha U structured and crystallizes in the orthorhombic Pnma space group. The structure is zero-dimensional and consists of four thallium(iii) chloride molecules. Tl3+ is bonded in a trigonal planar geometry to three Cl1- atoms. There are one shorter (2.38 Å) and two longer (2.40 Å) Tl–Cl bond lengths. There are two inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a single-bond geometry to one Tl3+ atom. In the second Cl1- site, Cl1- is bonded in a single-bond geometry to one Tl3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ErTlO3 by Materials Project

ErO3Tl is (Cubic) Perovskite structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional and consists of one thallium molecule and one ErO3 framework. In the ErO3 framework, Er3+ is bonded to six equivalent O2- atoms to form corner-sharing ErO6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Er–O bond lengths are 2.20 Å. O2- is bonded in a linear geometry to two equivalent Er3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KTl3O6 by Materials Project

KTl2O4TlO2 crystallizes in the orthorhombic Cmmm space group. The structure is two-dimensional and consists of two thallium molecules; four water molecules; and one KTl2O4 sheet oriented in the (0, 0, 1) direction. In the KTl2O4 sheet, K is bonded in a distorted rectangular see-saw-like geometry to four equivalent O atoms. All K–O bond lengths are 2.67 Å. Tl is bonded in a linear geometry to two equivalent O atoms. Both Tl–O bond lengths are 1.92 Å. O is bonded in a linear geometry to one K and one Tl atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TlN2Cl5O by Materials Project

TlCl3N2Cl2O crystallizes in the orthorhombic Pnma space group. The structure is zero-dimensional and consists of eight ammonia molecules, four chlorine monoxide molecules, and four thallium(iii) chloride molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tl3BiS6 by Materials Project

TlTl2BiS4(S)2 crystallizes in the orthorhombic Cmmm space group. The structure is two-dimensional and consists of four hydrogen sulfide molecules; two thallium molecules; and one Tl2BiS4 sheet oriented in the (0, 0, 1) direction. In the Tl2BiS4 sheet, Tl3+ is bonded in a linear geometry to two equivalent S2- atoms. Both Tl–S bond lengths are 2.54 Å. Bi3+ is bonded in a square co-planar geometry to four equivalent S2- atoms. All Bi–S bond lengths are 2.62 Å. S2- is bonded in a linear geometry to one Tl3+ and one Bi3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tl by Materials Project

Tl is alpha structured and crystallizes in the cubic I-43m space group. The structure is three-dimensional and consists of two thallium molecules and one Tl framework. In the Tl framework, there are three inequivalent Tl sites. In the first Tl site, Tl is bonded in a trigonal non-coplanar geometry to three equivalent Tl atoms. All Tl–Tl bond lengths are 3.46 Å. In the second Tl site, Tl is bonded in a 12-coordinate geometry to four Tl atoms. There are one shorter (3.29 Å) and two longer (3.47 Å) Tl–Tl bond lengths. In the third Tl site, Tl is bonded in a 6-coordinate geometry to six Tl atoms. There are one shorter (3.18 Å) and two longer (3.31 Å) Tl–Tl bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tl2HgTe by Materials Project

HgTl2Te is Cyanogen Chloride-like structured and crystallizes in the orthorhombic Immm space group. The structure is zero-dimensional and consists of two mercury molecules and two thallium telluride molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TlCr(SO10)2 by Materials Project

TlCrO12(SO4)2 crystallizes in the cubic Pa-3 space group. The structure is zero-dimensional and consists of eight sulfuric acid molecules, four thallium molecules, and four CrO12 clusters. In each CrO12 cluster, Cr is bonded in an octahedral geometry to six equivalent O atoms. All Cr–O bond lengths are 2.09 Å. There are two inequivalent O sites. In the first O site, O is bonded in a distorted bent 120 degrees geometry to one Cr and one O atom. The O–O bond length is 1.26 Å. In the second O site, O is bonded in a single-bond geometry to one O atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TaTlO12 by Materials Project

TaO12Tl is Zintl Phase structured and crystallizes in the cubic Fd-3m space group. The structure is zero-dimensional and consists of eight thallium molecules and eight TaO12 clusters. In each TaO12 cluster, Ta is bonded in a cuboctahedral geometry to twelve equivalent O atoms. All Ta–O bond lengths are 2.24 Å. O is bonded in a distorted single-bond geometry to one Ta atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TiTl2BF6 by Materials Project

TiF6(Tl)2B is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is zero-dimensional and consists of four boron molecules, eight thallium molecules, and four TiF6 clusters. In each TiF6 cluster, Ti3+ is bonded in an octahedral geometry to six equivalent F1- atoms. All Ti–F bond lengths are 1.98 Å. F1- is bonded in a single-bond geometry to one Ti3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tl3S by Materials Project

(Tl)3S is Uranium Silicide-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is zero-dimensional and consists of two hydrogen sulfide molecules and six thallium molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TlSO4 by Materials Project

TlSO4 crystallizes in the trigonal R32 space group. The structure is two-dimensional and consists of three thallium molecules and three Tl(SO4)2 sheets oriented in the (0, 0, 1) direction. In each Tl(SO4)2 sheet, Tl is bonded to six equivalent O atoms to form distorted TlO6 pentagonal pyramids that share corners with six equivalent SO4 tetrahedra. All Tl–O bond lengths are 2.29 Å. S is bonded to four O atoms to form SO4 tetrahedra that share corners with three equivalent TlO6 pentagonal pyramids. There is one shorter (1.47 Å) and three longer (1.50 Å) S–O bond length. There are two inequivalent O sites. In the first O site, O is bonded in a single-bond geometry to one S atom. In the second O site, O is bonded in a distorted bent 120 degrees geometry to one Tl and one S atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tl2F3 by Materials Project

TlTlF3 is alpha Rhenium trioxide-like structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional and consists of one thallium molecule and one TlF3 framework. In the TlF3 framework, Tl is bonded to six equivalent F atoms to form corner-sharing TlF6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Tl–F bond lengths are 2.36 Å. F is bonded in a linear geometry to two equivalent Tl atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TlPt3O4 by Materials Project

TlTl(Pt3O4)2 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional and consists of four thallium molecules and one Tl(Pt3O4)2 framework. In the Tl(Pt3O4)2 framework, Pt+2.33+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Pt–O bond lengths are 2.05 Å. Tl1+ is bonded in a body-centered cubic geometry to eight equivalent O2- atoms. All Tl–O bond lengths are 2.42 Å. O2- is bonded to three equivalent Pt+2.33+ and one Tl1+ atom to form a mixture of distorted edge and corner-sharing OTlPt3 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tl3Si by Materials Project

(Tl)3Si is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is zero-dimensional and consists of one silicon molecule and three thallium molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tl3Cl by Materials Project

(Tl)6Cl2 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is zero-dimensional and consists of one hydrochloric acid molecule and three thallium molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tl2S3 by Materials Project

TlTl3S4(S)2 crystallizes in the orthorhombic Cmmm space group. The structure is two-dimensional and consists of four hydrogen sulfide molecules; two thallium molecules; and one Tl3S4 sheet oriented in the (0, 0, 1) direction. In the Tl3S4 sheet, there are three inequivalent Tl3+ sites. In the first Tl3+ site, Tl3+ is bonded in a linear geometry to two S2- atoms. Both Tl–S bond lengths are 2.95 Å. In the second Tl3+ site, Tl3+ is bonded in a rectangular see-saw-like geometry to four equivalent S2- atoms. All Tl–S bond lengths are 3.09 Å. In the third Tl3+ site, Tl3+ is bonded in a square co-planar geometry to four equivalent S2- atoms. All Tl–S bond lengths are 3.09 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a 3-coordinate geometry to two Tl3+ and one S2- atom. The S–S bond length is 2.04 Å. In the second S2- site, S2- is bonded in a 3-coordinate geometry to two Tl3+ and one S2- atom. The S–S bond length is 2.04 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Development of a High-Energy Neutron Sniffer and Subsequent Dose Quantification for High-Energy Particle Accelerator Shielding Surveys

The objective of this research is to design a portable neutron detector that is lightweight and responds to neutrons with energies of 20 MeV and greater. The instrument will be used as a ‘sniffer’ probe for identifying shielding weaknesses at high-energy particle accelerators and be paired with a plastic scintillator to quantify the high-energy neutron dose equivalent. The sniffer probes are two different sizes and comprised of either cesium iodide or sodium iodide, all doped with thallium, making a total of four detectors. The probes were calibrated to respond only to radiations with 8 MeV electron equivalent energy or higher, vastly reducing detector response from background and lower energy radiations. The sniffer probes were tested using californium- 252 and americium-beryllium sources, followed by high-energy (up to 800 MeV) neutron exposures at the Los Alamos Neutron Science Center Weapons Neutron Research (WNR) facility. The sniffer probes were then used to identify areas around the accelerator facility where elevated levels of high-energy radiation was present and the plastic scintillators were placed in these locations to determine the high-energy neutron dose equivalent. The dose equivalent is calculated by measuring the 12 C(n,2n) 11 C reaction, which has a 20.4 MeV neutron threshold. Two locations behind the WNR facility were identified with the probes and the dose equivalent rates from neutron energies above 20 MeV were calculated to be 1.24 mrem/h behind flightpath 30-left and 1.53 behind flightpath 30-right. Of the four sniffer probes, the 2-inch x 2-inch cesium iodide is the recommended probe for performing high-energy shielding surveys. The larger crystal size yields higher sensitivity at lower count rates and the more dense material increases the likelihood of interaction within the crystal.

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗