Crystal Structure of the Solid Electrolyte, RbAg4I5

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Science  21 Jul 1967:
Vol. 157, Issue 3786, pp. 310-312
DOI: 10.1126/science.157.3786.310


The crystal structure of the solid electrolyte RbAg4I5 has been determined from single-crystal x-ray diffraction counter data. There are four RbAg4I5 in a cubic unit cell with a = 11.24 Å. The structure refinement, by least squares, is based on space group P413 (O7). The arrangement of the iodide ions is similar to that of the manganese atoms in β-manganese, and provides 56 iodide tetrahedra per unit cell, which share faces in such manner as to provide diffusion paths for the silver ions. The occurrence of the two low-temperature phases of RbAg4I5 has been established by x-ray diffraction and optical examination.