RbTmBr3 is Orthorhombic Perovskite structured and crystallizes in the orthorhombic Pnma space group. Rb(1) is bonded in a 8-coordinate geometry to two equivalent Br(2) and six equivalent Br(1) atoms. Tm(1) is bonded to two equivalent Br(2) and four equivalent Br(1) atoms to form corner-sharing TmBr6 octahedra. The corner-sharing octahedral tilt angles are 24°. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded in a 5-coordinate geometry to three equivalent Rb(1) and two equivalent Tm(1) atoms. In the second Br site, Br(2) is bonded in a 4-coordinate geometry to two equivalent Rb(1) and two equivalent Tm(1) atoms.
RbTmBr3 is Orthorhombic Perovskite structured and crystallizes in the orthorhombic Pnma space group. Rb(1) is bonded in a 8-coordinate geometry to two equivalent Br(2) and six equivalent Br(1) atoms. There is one shorter (3.48 Å) and one longer (3.53 Å) Rb(1)-Br(2) bond length. There are a spread of Rb(1)-Br(1) bond distances ranging from 3.55-3.82 Å. Tm(1) is bonded to two equivalent Br(2) and four equivalent Br(1) atoms to form corner-sharing TmBr6 octahedra. The corner-sharing octahedral tilt angles are 24°. Both Tm(1)-Br(2) bond lengths are 2.85 Å. All Tm(1)-Br(1) bond lengths are 2.84 Å. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded in a 5-coordinate geometry to three equivalent Rb(1) and two equivalent Tm(1) atoms. In the second Br site, Br(2) is bonded in a 4-coordinate geometry to two equivalent Rb(1) and two equivalent Tm(1) atoms.