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Ferroelectrics Volume 144, 1993 - Issue 1
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Structure and crystal growth

Structure and properties of new ferroelectric crystals M5Nb3OF18 (M = NH4, K, Rb)

N. Sidorov Institute of Chemistry Kola Science Centre of the Russian Acad. of Sciences, 184200 Apatity, Murmansk Region, Russia
,
V. Mitrofanov Institute of Chemistry Kola Science Centre of the Russian Acad. of Sciences, 184200 Apatity, Murmansk Region, Russia
,
V. Kuznetsov Institute of Chemistry Kola Science Centre of the Russian Acad. of Sciences, 184200 Apatity, Murmansk Region, Russia
,
A. Gutsol Institute of Chemistry Kola Science Centre of the Russian Acad. of Sciences, 184200 Apatity, Murmansk Region, Russia
,
V. Kalinnikov Institute of Chemistry Kola Science Centre of the Russian Acad. of Sciences, 184200 Apatity, Murmansk Region, Russia
&
S. Stefanovich Karpov Institute of Physical Chemistry, 107120, Moscow, Russia
Pages 223-230 | Received 22 Jun 1992, Published online: 10 Feb 2011
 
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Abstract

By methods of vibration spectroscopy and X-ray analysis ferroelectrics M5Nb3OF18 (M = NH4, K, Rb) have been studied at various temperatures. In Rb5Nb3OF18 crystal, alongside with reversible ferroelectric phase transition (Tc = 600 K), destructive transformation was shown to develop resulting in the destruction of oxofluoroniobate chain in the structure due to the break of Nb—O—Nb bridge bonds and chemical reactions occur.

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Related Research Data

Negative thermal expansion in functional materials: controllable thermal expansion by chemical modifications
Source: Royal Society of Chemistry (RSC)

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