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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on SrU3(SeO9)2 by Materials Project

SrU3(SeO7)2(O2)2 crystallizes in the monoclinic C2 space group. The structure is three-dimensional and consists of four hydrogen peroxide molecules and one SrU3(SeO7)2 framework. In the SrU3(SeO7)2 framework, Sr is bonded to six O atoms to form distorted SrO6 pentagonal pyramids that share corners with four equivalent UO7 pentagonal bipyramids. There are a spread of Sr–O bond distances ranging from 2.61–2.76 Å. There are two inequivalent U sites. In the first U site, U is bonded to seven O atoms to form distorted UO7 pentagonal bipyramids that share corners with two equivalent SrO6 pentagonal pyramids and an edgeedge with one UO7 pentagonal bipyramid. There are a spread of U–O bond distances ranging from 1.86–2.39 Å. In the second U site, U is bonded in a 8-coordinate geometry to eight O atoms. There are a spread of U–O bond distances ranging from 1.84–2.64 Å. Se is bonded in a trigonal non-coplanar geometry to three O atoms. There are a spread of Se–O bond distances ranging from 1.71–1.74 Å. There are eight inequivalent O sites. In the first O site, O is bonded in a trigonal planar geometry to three U atoms. In the second O site, O is bonded in a trigonal planar geometry to three U atoms. In the third O site, O is bonded in a distorted single-bond geometry to one Sr and one U atom. In the fourth O site, O is bonded in a distorted single-bond geometry to one Sr and one U atom. In the fifth O site, O is bonded in a distorted bent 120 degrees geometry to one Sr and one U atom. In the sixth O site, O is bonded in a 3-coordinate geometry to two U and one Se atom. In the seventh O site, O is bonded in a 3-coordinate geometry to two U and one Se atom. In the eighth O site, O is bonded in a bent 120 degrees geometry to one U and one Se atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SrU(SeO5)2 by Materials Project

SrU(SeO5)2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. Sr2+ is bonded in a 5-coordinate geometry to eight O2- atoms. There are a spread of Sr–O bond distances ranging from 2.41–3.17 Å. U6+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of U–O bond distances ranging from 1.82–2.62 Å. There are two inequivalent Se6+ sites. In the first Se6+ site, Se6+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. There are a spread of Se–O bond distances ranging from 1.72–1.75 Å. In the second Se6+ site, Se6+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. There are a spread of Se–O bond distances ranging from 1.68–1.79 Å. There are ten inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one Sr2+ and one U6+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to one U6+ atom. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to one U6+ and one Se6+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to one Sr2+, one U6+, and one Se6+ atom. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent U6+ and one Se6+ atom. In the sixth O2- site, O2- is bonded in a bent 120 degrees geometry to one Sr2+ and one Se6+ atom. In the seventh O2- site, O2- is bonded in a bent 150 degrees geometry to one U6+ and one Se6+ atom. In the eighth O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Sr2+ and one Se6+ atom. In the ninth O2- site, O2- is bonded in a 1-coordinate geometry to one Sr2+ and one O2- atom. The O–O bond length is 1.23 Å. In the tenth O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Sr2+ and one O2- atom. The O–O bond length is 1.25 Å.

36 MATERIALS SCIENCE↗