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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on RbTmBr3 by Materials Project

RbTmBr3 is Orthorhombic Perovskite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Rb is bonded in a 8-coordinate geometry to eight Br atoms. There are a spread of Rb–Br bond distances ranging from 3.48–3.82 Å. Tm is bonded to six Br atoms to form corner-sharing TmBr6 octahedra. The corner-sharing octahedral tilt angles are 24°. There are four shorter (2.84 Å) and two longer (2.85 Å) Tm–Br bond lengths. There are two inequivalent Br sites. In the first Br site, Br is bonded in a 5-coordinate geometry to three equivalent Rb and two equivalent Tm atoms. In the second Br site, Br is bonded in a 4-coordinate geometry to two equivalent Rb and two equivalent Tm atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb5Tm3Br12 by Materials Project

Rb5Tm3Br12 crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. there are two inequivalent Rb sites. In the first Rb site, Rb is bonded in a 6-coordinate geometry to six equivalent Br atoms. All Rb–Br bond lengths are 3.54 Å. In the second Rb site, Rb is bonded in a 7-coordinate geometry to seven Br atoms. There are a spread of Rb–Br bond distances ranging from 3.48–3.69 Å. Tm is bonded to six Br atoms to form edge-sharing TmBr6 octahedra. There are a spread of Tm–Br bond distances ranging from 2.80–2.90 Å. There are three inequivalent Br sites. In the first Br site, Br is bonded to two equivalent Rb and two equivalent Tm atoms to form distorted corner-sharing BrRb2Tm2 trigonal pyramids. In the second Br site, Br is bonded in a 3-coordinate geometry to one Rb and two equivalent Tm atoms. In the third Br site, Br is bonded in a 5-coordinate geometry to four Rb and one Tm atom.

36 MATERIALS SCIENCE↗