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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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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on UGeO4 by Materials Project

UGeO4 is Zircon-like structured and crystallizes in the tetragonal I4_1/a space group. The structure is three-dimensional. U4+ is bonded in a 8-coordinate geometry to eight equivalent O2- atoms. There are four shorter (2.34 Å) and four longer (2.40 Å) U–O bond lengths. Ge4+ is bonded in a tetrahedral geometry to four equivalent O2- atoms. All Ge–O bond lengths are 1.80 Å. O2- is bonded in a distorted trigonal planar geometry to two equivalent U4+ and one Ge4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on UGeO2 by Materials Project

UO2Ge crystallizes in the tetragonal I4_1/a space group. The structure is three-dimensional and consists of eight germanium molecules and one UO2 framework. In the UO2 framework, U is bonded in a 6-coordinate geometry to six equivalent O atoms. There are a spread of U–O bond distances ranging from 2.14–2.44 Å. O is bonded in a distorted trigonal non-coplanar geometry to three equivalent U atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on U2GeO10 by Materials Project

U2GeO10 crystallizes in the orthorhombic Fddd space group. The structure is three-dimensional. U is bonded to seven O atoms to form distorted UO7 pentagonal bipyramids that share corners with two equivalent GeO4 tetrahedra, edges with two equivalent UO7 pentagonal bipyramids, and an edgeedge with one GeO4 tetrahedra. There are a spread of U–O bond distances ranging from 1.81–2.55 Å. Ge is bonded to four equivalent O atoms to form GeO4 tetrahedra that share corners with four equivalent UO7 pentagonal bipyramids and edges with two equivalent UO7 pentagonal bipyramids. All Ge–O bond lengths are 1.77 Å. There are three inequivalent O sites. In the first O site, O is bonded in a 3-coordinate geometry to two equivalent U and one Ge atom. In the second O site, O is bonded in a single-bond geometry to one U atom. In the third O site, O is bonded in a single-bond geometry to one U atom.

36 MATERIALS SCIENCE↗