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Effet Jahn-Teller et structure cristalline de l'hydroxyde CuSn(OH)6

1976; Elsevier BV; Volume: 17; Issue: 4 Linguagem: Inglês

10.1016/s0022-4596(76)80010-2

1095-726X

Irène Morgenstern‐Badarau,

Radioactive element chemistry and processing

Tin IV-copper II hydroxide, CuSn(OH)6, belongs to the isostructural family of MIISn(OH)6 hydroxides; these hydroxides are described as ReO3 oxide-type superstructures. When CuII replaces the divalent MII ion, the symmetry reduces to tetragonal. This distortion is attributed to a CuII cooperative Jahn-Teller effect. Results of a structural analysis based on powder data are presented. It is shown that the symmetry is lowered just enough for the CuII ground term to be nondegenerate, and, at the same time, for the typical macroscopic symmetry to be preserved.