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At least 1,657 records · Page 92
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DOE OSTI2020

Materials Data on Pr2(GeIr)3 by Materials Project

Pr2(IrGe)3 crystallizes in the tetragonal P4/mmm space group. The structure is one-dimensional and consists of one Pr2(IrGe)3 ribbon oriented in the (0, 0, 1) direction. Pr is bonded in a linear geometry to one Ir and one Ge atom. The Pr–Ir bond length is 2.32 Å. The Pr–Ge bond length is 2.84 Å. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a linear geometry to one Pr and one Ge atom. The Ir–Ge bond length is 2.31 Å. In the second Ir site, Ir is bonded in a linear geometry to two equivalent Ge atoms. Both Ir–Ge bond lengths are 2.32 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a linear geometry to one Pr and one Ir atom. In the second Ge site, Ge is bonded in a linear geometry to two equivalent Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ge3B by Materials Project

BGe3 is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. B is bonded in a body-centered cubic geometry to eight equivalent Ge atoms. All B–Ge bond lengths are 2.78 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a distorted body-centered cubic geometry to four equivalent B and four equivalent Ge atoms. All Ge–Ge bond lengths are 2.78 Å. In the second Ge site, Ge is bonded in a body-centered cubic geometry to eight equivalent Ge atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Dy3(GeRh)2 by Materials Project

Dy3(RhGe)2 crystallizes in the orthorhombic Pbcm space group. The structure is three-dimensional. there are two inequivalent Dy sites. In the first Dy site, Dy is bonded in a 9-coordinate geometry to four equivalent Rh and five Ge atoms. There are two shorter (3.03 Å) and two longer (3.07 Å) Dy–Rh bond lengths. There are a spread of Dy–Ge bond distances ranging from 3.01–3.31 Å. In the second Dy site, Dy is bonded in a 7-coordinate geometry to four equivalent Rh and five Ge atoms. There are a spread of Dy–Rh bond distances ranging from 2.91–3.15 Å. There are a spread of Dy–Ge bond distances ranging from 3.00–3.36 Å. Rh is bonded in a 9-coordinate geometry to six Dy and three Ge atoms. There are a spread of Rh–Ge bond distances ranging from 2.54–2.62 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to seven Dy and two equivalent Rh atoms. In the second Ge site, Ge is bonded in a 12-coordinate geometry to eight Dy and four equivalent Rh atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr3(GeRu)2 by Materials Project

Pr3(RuGe)2 crystallizes in the orthorhombic Pbcm space group. The structure is three-dimensional. there are two inequivalent Pr sites. In the first Pr site, Pr is bonded in a 1-coordinate geometry to four equivalent Ru and five Ge atoms. There are a spread of Pr–Ru bond distances ranging from 2.92–3.19 Å. There are a spread of Pr–Ge bond distances ranging from 3.15–3.58 Å. In the second Pr site, Pr is bonded in a 9-coordinate geometry to four equivalent Ru and five Ge atoms. There are two shorter (3.14 Å) and two longer (3.25 Å) Pr–Ru bond lengths. There are a spread of Pr–Ge bond distances ranging from 3.09–3.44 Å. Ru is bonded in a 9-coordinate geometry to six Pr and three Ge atoms. There are two shorter (2.59 Å) and one longer (2.62 Å) Ru–Ge bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to seven Pr and two equivalent Ru atoms. In the second Ge site, Ge is bonded to eight Pr and four equivalent Ru atoms to form a mixture of distorted corner, edge, and face-sharing GePr8Ru4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr(GeIr)2 by Materials Project

PrIr2Ge2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Pr is bonded in a 8-coordinate geometry to eight Ir and eight Ge atoms. There are four shorter (3.27 Å) and four longer (3.36 Å) Pr–Ir bond lengths. There are four shorter (3.28 Å) and four longer (3.31 Å) Pr–Ge bond lengths. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 9-coordinate geometry to four equivalent Pr and five Ge atoms. There are one shorter (2.46 Å) and four longer (2.51 Å) Ir–Ge bond lengths. In the second Ir site, Ir is bonded in a 4-coordinate geometry to four equivalent Pr and four equivalent Ge atoms. All Ir–Ge bond lengths are 2.53 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent Pr and five Ir atoms. In the second Ge site, Ge is bonded in a 4-coordinate geometry to four equivalent Pr and four equivalent Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr(Ge2Rh3)2 by Materials Project

Pr(Rh3Ge2)2 crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Pr is bonded to six equivalent Rh and six equivalent Ge atoms to form face-sharing PrGe6Rh6 cuboctahedra. All Pr–Rh bond lengths are 3.19 Å. All Pr–Ge bond lengths are 3.17 Å. There are two inequivalent Rh sites. In the first Rh site, Rh is bonded in a 5-coordinate geometry to five Ge atoms. There are one shorter (2.51 Å) and four longer (2.58 Å) Rh–Ge bond lengths. In the second Rh site, Rh is bonded in a 6-coordinate geometry to two equivalent Pr and four Ge atoms. There are two shorter (2.50 Å) and two longer (2.57 Å) Rh–Ge bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to nine Rh atoms. In the second Ge site, Ge is bonded in a 8-coordinate geometry to two equivalent Pr and six Rh atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NdGe5 by Materials Project

NdGe5 crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. Nd is bonded in a 10-coordinate geometry to fourteen Ge atoms. There are a spread of Nd–Ge bond distances ranging from 3.13–3.53 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 8-coordinate geometry to three equivalent Nd and five Ge atoms. There are a spread of Ge–Ge bond distances ranging from 2.58–2.94 Å. In the second Ge site, Ge is bonded in a 2-coordinate geometry to two equivalent Nd and eight equivalent Ge atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Nd(GeIr)2 by Materials Project

Nd(IrGe)2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Nd is bonded in a 12-coordinate geometry to eight Ir and eight Ge atoms. There are four shorter (3.25 Å) and four longer (3.39 Å) Nd–Ir bond lengths. There are four shorter (3.27 Å) and four longer (3.29 Å) Nd–Ge bond lengths. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 4-coordinate geometry to four equivalent Nd and four equivalent Ge atoms. All Ir–Ge bond lengths are 2.53 Å. In the second Ir site, Ir is bonded in a 9-coordinate geometry to four equivalent Nd and five Ge atoms. There are one shorter (2.46 Å) and four longer (2.50 Å) Ir–Ge bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 4-coordinate geometry to four equivalent Nd and four equivalent Ir atoms. In the second Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent Nd and five Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ge3As by Materials Project

Ge3As is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. there are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a body-centered cubic geometry to four equivalent Ge and four equivalent As atoms. All Ge–Ge bond lengths are 2.93 Å. All Ge–As bond lengths are 2.93 Å. In the second Ge site, Ge is bonded in a body-centered cubic geometry to eight equivalent Ge atoms. As is bonded in a body-centered cubic geometry to eight equivalent Ge atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Er2Al3Ge4 by Materials Project

Er2Al3Ge4 crystallizes in the orthorhombic Cmce space group. The structure is three-dimensional. Er is bonded in a 8-coordinate geometry to eight Ge atoms. There are a spread of Er–Ge bond distances ranging from 3.06–3.18 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded to six Ge atoms to form distorted corner-sharing AlGe6 octahedra. The corner-sharing octahedral tilt angles are 30°. There are four shorter (2.56 Å) and two longer (2.75 Å) Al–Ge bond lengths. In the second Al site, Al is bonded in a 5-coordinate geometry to five Ge atoms. There are a spread of Al–Ge bond distances ranging from 2.53–2.85 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 7-coordinate geometry to four equivalent Er and three Al atoms. In the second Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent Er and five Al atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm4(GeO5)3 by Materials Project

Sm4(GeO5)3 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are two inequivalent Sm sites. In the first Sm site, Sm is bonded to eight O atoms to form distorted SmO8 pentagonal bipyramids that share corners with two equivalent GeO4 tetrahedra and edges with three equivalent SmO8 pentagonal bipyramids. There are a spread of Sm–O bond distances ranging from 2.31–2.88 Å. In the second Sm site, Sm is bonded in a 8-coordinate geometry to eight O atoms. There are a spread of Sm–O bond distances ranging from 2.33–2.91 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded to four O atoms to form GeO4 tetrahedra that share corners with two equivalent GeO6 octahedra and corners with two equivalent SmO8 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 57°. There is two shorter (1.76 Å) and two longer (1.79 Å) Ge–O bond length. In the second Ge site, Ge is bonded to six O atoms to form GeO6 octahedra that share corners with two equivalent GeO6 octahedra and corners with four equivalent GeO4 tetrahedra. The corner-sharing octahedral tilt angles are 45°. There is four shorter (1.93 Å) and two longer (1.94 Å) Ge–O bond length. There are seven inequivalent O sites. In the first O site, O is bonded in a trigonal planar geometry to two Sm and one Ge atom. In the second O site, O is bonded in a distorted trigonal planar geometry to two Sm and one Ge atom. In the third O site, O is bonded to two equivalent Sm and two equivalent Ge atoms to form distorted corner-sharing OSm2Ge2 tetrahedra. In the fourth O site, O is bonded in a distorted trigonal non-coplanar geometry to three Sm atoms. In the fifth O site, O is bonded in a bent 150 degrees geometry to two equivalent Sm atoms. In the sixth O site, O is bonded in a rectangular see-saw-like geometry to four Sm atoms. In the seventh O site, O is bonded in a distorted trigonal planar geometry to one Sm and two Ge atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm2Al3Ge4 by Materials Project

Sm2Al3Ge4 crystallizes in the orthorhombic Cmce space group. The structure is three-dimensional. Sm is bonded in a 8-coordinate geometry to eight Ge atoms. There are a spread of Sm–Ge bond distances ranging from 3.11–3.22 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded to six Ge atoms to form distorted corner-sharing AlGe6 octahedra. The corner-sharing octahedral tilt angles are 32°. There are four shorter (2.60 Å) and two longer (2.80 Å) Al–Ge bond lengths. In the second Al site, Al is bonded in a 5-coordinate geometry to five Ge atoms. There are a spread of Al–Ge bond distances ranging from 2.54–2.88 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 7-coordinate geometry to four equivalent Sm and three Al atoms. In the second Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent Sm and five Al atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Th(GeIr)2 by Materials Project

Th(IrGe)2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Th is bonded in a 8-coordinate geometry to eight Ir and eight Ge atoms. There are four shorter (3.26 Å) and four longer (3.35 Å) Th–Ir bond lengths. There are four shorter (3.26 Å) and four longer (3.30 Å) Th–Ge bond lengths. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 4-coordinate geometry to four equivalent Th and four equivalent Ge atoms. All Ir–Ge bond lengths are 2.53 Å. In the second Ir site, Ir is bonded in a 9-coordinate geometry to four equivalent Th and five Ge atoms. There are one shorter (2.44 Å) and four longer (2.51 Å) Ir–Ge bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 4-coordinate geometry to four equivalent Th and four equivalent Ir atoms. In the second Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent Th and five Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on GaGe3 by Materials Project

GaGe3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ga is bonded to twelve Ge atoms to form GaGe12 cuboctahedra that share corners with six equivalent GaGe12 cuboctahedra, corners with twelve equivalent GeGa4Ge8 cuboctahedra, edges with eighteen GeGa4Ge8 cuboctahedra, faces with eight equivalent GaGe12 cuboctahedra, and faces with twelve GeGa4Ge8 cuboctahedra. There are six shorter (2.99 Å) and six longer (3.07 Å) Ga–Ge bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded to four equivalent Ga and eight Ge atoms to form distorted GeGa4Ge8 cuboctahedra that share corners with four equivalent GaGe12 cuboctahedra, corners with fourteen GeGa4Ge8 cuboctahedra, edges with six equivalent GaGe12 cuboctahedra, edges with twelve GeGa4Ge8 cuboctahedra, faces with four equivalent GaGe12 cuboctahedra, and faces with sixteen GeGa4Ge8 cuboctahedra. There are a spread of Ge–Ge bond distances ranging from 2.94–3.05 Å. In the second Ge site, Ge is bonded to four equivalent Ga and eight equivalent Ge atoms to form distorted GeGa4Ge8 cuboctahedra that share corners with four equivalent GaGe12 cuboctahedra, corners with fourteen GeGa4Ge8 cuboctahedra, edges with six equivalent GaGe12 cuboctahedra, edges with twelve equivalent GeGa4Ge8 cuboctahedra, faces with four equivalent GaGe12 cuboctahedra, and faces with sixteen GeGa4Ge8 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr(GePt)2 by Materials Project

Pr(PtGe)2 crystallizes in the monoclinic P2_1 space group. The structure is three-dimensional. Pr is bonded in a 12-coordinate geometry to eight Pt and eight Ge atoms. There are a spread of Pr–Pt bond distances ranging from 3.30–3.44 Å. There are a spread of Pr–Ge bond distances ranging from 3.27–3.42 Å. There are two inequivalent Pt sites. In the first Pt site, Pt is bonded in a 9-coordinate geometry to four equivalent Pr and five Ge atoms. There are one shorter (2.48 Å) and four longer (2.53 Å) Pt–Ge bond lengths. In the second Pt site, Pt is bonded in a 4-coordinate geometry to four equivalent Pr and four equivalent Ge atoms. There are a spread of Pt–Ge bond distances ranging from 2.56–2.58 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent Pr and five Pt atoms. In the second Ge site, Ge is bonded in a 4-coordinate geometry to four equivalent Pr and four equivalent Pt atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li2Ge3O8 by Materials Project

Li2Ge3O8 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are two inequivalent Li sites. In the first Li site, Li is bonded to six O atoms to form LiO6 octahedra that share corners with four equivalent GeO4 tetrahedra, edges with three LiO6 octahedra, and edges with three equivalent GeO6 octahedra. There are a spread of Li–O bond distances ranging from 2.08–2.18 Å. In the second Li site, Li is bonded to six O atoms to form LiO6 octahedra that share corners with six equivalent GeO4 tetrahedra, an edgeedge with one LiO6 octahedra, and edges with two equivalent GeO6 octahedra. There are a spread of Li–O bond distances ranging from 2.11–2.19 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded to four O atoms to form GeO4 tetrahedra that share corners with two equivalent GeO6 octahedra, corners with five LiO6 octahedra, and corners with two equivalent GeO4 tetrahedra. The corner-sharing octahedra tilt angles range from 50–63°. There are a spread of Ge–O bond distances ranging from 1.75–1.81 Å. In the second Ge site, Ge is bonded to six O atoms to form GeO6 octahedra that share corners with four equivalent GeO4 tetrahedra and edges with five LiO6 octahedra. There are a spread of Ge–O bond distances ranging from 1.86–1.97 Å. There are four inequivalent O sites. In the first O site, O is bonded in a distorted trigonal planar geometry to one Li and two Ge atoms. In the second O site, O is bonded in a trigonal non-coplanar geometry to two Li and one Ge atom. In the third O site, O is bonded in a trigonal planar geometry to one Li and two equivalent Ge atoms. In the fourth O site, O is bonded in a rectangular see-saw-like geometry to two equivalent Li and two Ge atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Investigation of the electrical conduction mechanisms in P-type amorphous germanium electrical contacts for germanium detectors in searching for rare-event physics

For the first time, electrical conduction mechanisms in the disordered material system is experimentally studied for p-type amorphous germanium (a-Ge) used for high-purity Ge detector contacts. The localization length and the hopping parameters in a-Ge are determined using the surface leakage current measured from three high-purity planar Ge detectors. The temperature dependent hopping distance and hopping energy are obtained for a-Ge fabricated as the electrical contact materials for high-purity Ge planar detectors. As a result, we find that the hopping energy in a-Ge increases as temperature increases while the hopping distance in a-Ge decreases as temperature increases. The localization length of a-Ge is on the order of 2.13$^{-0.05}_{+0.07}$A° to 5.07$^{0.83}_{+2.58}$A°,depending on the density of states near the Fermi energy level within bandgap. Using these parameters, we predict that the surface leakage current from a Ge detector with a-Ge contacts can be much smaller than one yocto amp (yA) at helium temperature, suitable for rare-event physics searches.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
NASA NTRS2010

Determining the Metal/Silicate Partition Coefficient of Germanium: Implications for Core and Mantle Differentiation.

Currently there are several hypotheses for the thermal state of the early Earth. Some hypothesize a shallow magma ocean, or deep magma ocean, or heterogeneous accretion which requires no magma ocean at all. Previous models are unable to account for Ge depletion in Earth's mantle relative to CI chondrites. In this study, the element Ge is used to observe the way siderophile elements partition into the metallic core. The purpose of this research is to provide new data for Ge and to further test these models for Earth's early stages. The partition coefficients (D(sub Ge) = c(sub metal)/c(sub silicate), where D = partition coefficient of Ge and c = concentration of Ge in the metal and silicate, respectively) of siderophile elements were studied by performing series of high pressure, high temperature experiments. They are also dependent on oxygen fugacity, and metal and silicate composition. Ge is a moderately siderophile element found in both the mantle and core, and has yet to be studied systematically at high temperatures. Moreover, previous work has been limited by the low solubility of Ge in silicate melts (less than 100 ppm and close to detection limits for electron microprobe analysis). Reported here are results from 14 experiments studying the partitioning of Ge between silicate and metallic liquids. The Ge concentrations were then analyzed using Laser Ablation Inductively Coupled Mass Spectrometry (LA-ICP-MS) which is sensitive enough to detect ppm levels of Ge in the silicate melt.

King, C.↗