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Ba2Cu(HCOO)6, Thermal Behavior and Crystal Structure of the Room Temperature Phase

✍ Scribed by D. Vega; G. Polla; A.G. Leyva; H. Lanza; P.K. de Perazzo; R. Baggio; M.A.R. de Benyacar; J. Ellena; H. Tolentino; M. do Carmo Martins Alves

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 175 KB
Volume: 147
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.1999.8415

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✦ Synopsis

Ba 2 Cu(HCOO) 6 grown at room temperature crystallizes in space group P2

On heating, the following changes are observed: (1) a reversible, hysteretic, 5rstorder phase transition at about 40}903C; (2) partial decomposition at 1903C; and (3) an irreversible change at 2303C related to decomposition. We have assigned to a new -Ba(HCOO) 2 metastable phase one of the main components found when Ba 2 Cu(HCOO) 6 samples are quenched from 1903C. A room temperature model structure of Ba 2 Cu(HCOO) 6 is given. The copper atoms are surrounded by seven oxygen atoms, 5ve of them de5ning an almost perfect square pyramid, and the remaining two, opposite to the apex, at hemicoordination distances of ca. 2.85 A s A s . The barium atoms display irregular, ninefold coordination polyhedra.

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