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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on RbCr(SO4)2 by Materials Project

RbCr(SO4)2 crystallizes in the trigonal P-3c1 space group. The structure is three-dimensional. Rb1+ is bonded to six equivalent O2- atoms to form distorted RbO6 cuboctahedra that share corners with six equivalent SO4 tetrahedra and edges with six equivalent RbO6 cuboctahedra. All Rb–O bond lengths are 3.05 Å. Cr3+ is bonded to six equivalent O2- atoms to form CrO6 octahedra that share corners with six equivalent SO4 tetrahedra. All Cr–O bond lengths are 2.01 Å. S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share corners with three equivalent RbO6 cuboctahedra and corners with three equivalent CrO6 octahedra. The corner-sharing octahedral tilt angles are 40°. There is one shorter (1.46 Å) and three longer (1.50 Å) S–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Cr3+ and one S6+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to three equivalent Rb1+ and one S6+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RbCr(SO4)2 by Materials Project

RbCr(SO4)2 crystallizes in the trigonal P321 space group. The structure is three-dimensional. Rb1+ is bonded to twelve O2- atoms to form distorted RbO12 cuboctahedra that share edges with six equivalent RbO12 cuboctahedra, edges with six equivalent SO4 tetrahedra, and faces with two equivalent CrO6 octahedra. There are six shorter (3.06 Å) and six longer (3.44 Å) Rb–O bond lengths. Cr3+ is bonded to six equivalent O2- atoms to form distorted CrO6 octahedra that share corners with six equivalent SO4 tetrahedra and faces with two equivalent RbO12 cuboctahedra. All Cr–O bond lengths are 2.02 Å. S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share corners with three equivalent CrO6 octahedra and edges with three equivalent RbO12 cuboctahedra. The corner-sharing octahedral tilt angles are 34°. There is one shorter (1.46 Å) and three longer (1.49 Å) S–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 150 degrees geometry to one Rb1+, one Cr3+, and one S6+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to three equivalent Rb1+ and one S6+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RbCr(SO10)2 by Materials Project

RbCrO12(SO4)2 crystallizes in the cubic Pa-3 space group. The structure is three-dimensional and consists of eight sulfuric acid molecules and one RbCrO12 framework. In the RbCrO12 framework, Rb is bonded in a distorted cuboctahedral geometry to six equivalent O atoms. All Rb–O bond lengths are 3.20 Å. Cr is bonded in an octahedral geometry to six equivalent O atoms. All Cr–O bond lengths are 2.10 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 1.25 Å. In the second O site, O is bonded in a water-like geometry to one Rb and one O atom.

36 MATERIALS SCIENCE↗