Materials Data on Sm3BeCrS7 by Materials Project
BeSm3CrS7 crystallizes in the hexagonal P6_3 space group. The structure is three-dimensional. Be2+ is bonded in a tetrahedral geometry to four S2- atoms. There are one shorter (2.09 Å) and three longer (2.11 Å) Be–S bond lengths. Sm3+ is bonded in a 7-coordinate geometry to seven S2- atoms. There are a spread of Sm–S bond distances ranging from 2.72–3.13 Å. Cr3+ is bonded to six equivalent S2- atoms to form face-sharing CrS6 octahedra. There are three shorter (2.40 Å) and three longer (2.46 Å) Cr–S bond lengths. There are three inequivalent S2- sites. In the first S2- site, S2- is bonded in a 5-coordinate geometry to three equivalent Sm3+ and two equivalent Cr3+ atoms. In the second S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to one Be2+ and three equivalent Sm3+ atoms. In the third S2- site, S2- is bonded in a 4-coordinate geometry to one Be2+ and three equivalent Sm3+ atoms.