Materials Data on RbCaSb by Materials Project
RbCaSb is Matlockite structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Rb1+ is bonded in a 5-coordinate geometry to five equivalent Sb3- atoms. There are one shorter (3.76 Å) and four longer (4.09 Å) Rb–Sb bond lengths. Ca2+ is bonded to four equivalent Sb3- atoms to form a mixture of corner and edge-sharing CaSb4 tetrahedra. All Ca–Sb bond lengths are 3.18 Å. Sb3- is bonded in a 9-coordinate geometry to five equivalent Rb1+ and four equivalent Ca2+ atoms.
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