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BIBTEX RIS

M 3− x (NH 4 ) x CrO 8 (M = Na, K, Rb, Cs): A New Family of Cr 5+ -Based Magnetic Ferroelectrics

2011; American Chemical Society; Volume: 133; Issue: 11 Linguagem: Inglês

10.1021/ja1117683

ISSN

1943-2984

Autores

Raghabendra Samantaray, Ronald J. Clark, Eun Sang Choi, Haidong Zhou, Naresh S. Dalal,

Tópico(s)

Solid-state spectroscopy and crystallography

Resumo

Upon consideration of the hydrogen-bonding properties of the NH(4)(+) cation, we synthesized a new class of compounds, M(3-x)(NH(4))(x)CrO(8) (M = Na, K, Rb, Cs). These magnetic compounds with the simple 3d(1) ground state become ferroelectric. X-ray studies confirmed that the phase transition involves a symmetry change from I42m to Cmc2(1) to P1. The transition temperature depends linearly on the composition variable x. The transitions are of the order-disorder type, with N-H···O bonding playing the central role in the mechanism. Extension of this idea to the introduction of ferroelectricity in several other classes of materials is suggested.

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