Investigation of valence states in the perovskite oxides, LaAFeNbO(6) (A = Ca, Sr)

Ramakrishnan, PA and Varadaraju, UV and Berry, FJ (1999) Investigation of valence states in the perovskite oxides, LaAFeNbO(6) (A = Ca, Sr). In: Materials Letters, 38 (6). pp. 396-400.

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Abstract

Compounds of the type, LaAFeNbO(6) (A = Ca Sr) have been synthesized to study the electrical and magnetic properties and to examine valence degeneracy. The results show that valence degeneracy is not operative and the compounds are insulating. Magnetic susceptibility data show that part of the Fe is in Fs(2+) state, thus oxidizing part of Nb4+ to Nb5+ by an internal redox mechanism. The presence of mixed valent Fe is confirmed by Mossbauer spectra. (C) 1999 Elsevier Science B.V. All rights reserved.

Item Type:	Journal Article
Publication:	Materials Letters
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Perovskite;Valence degeneracy;Mo¨ssbauer spectra;Internal redox mechanism
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	23 Jun 2011 07:07
Last Modified:	23 Jun 2011 07:07
URI:	http://eprints.iisc.ac.in/id/eprint/38594

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