Infrared and Mössbauer spectroscopic study of the metal-insulator transition in some oxides of perovskite structure

Ganguly, P and Vasanthacharya, NY (1986) Infrared and Mössbauer spectroscopic study of the metal-insulator transition in some oxides of perovskite structure. In: Journal of Solid State Chemistry, 61 (2). pp. 164-170.

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Abstract

The IR spectra of some LaNi1−xBxO3 (B = Cr, Fe, and Co) compounds having perovskite structure have been studied in the range 1000−300 cm−1. An investigation of the changes in the metal-oxygen stretching frequency as x → xc from the insulating side has been carried out. An important feature is that as x → xc the vibrational features in the infrared spectra disappear when the resistivity is not, vert, similar10−1 Ω cm which is of two orders of magnitude more than the value of varrho0 at which the temperature coefficient of resistance changes sign. Mössbauer studies on Fe-containing samples with various conductivities show that the isomer shift decreases as conductivity increases which is indicative of larger Fe---O overlap.

Item Type:	Journal Article
Publication:	Journal of Solid State Chemistry
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	31 Aug 2009 13:07
Last Modified:	19 Sep 2010 05:43
URI:	http://eprints.iisc.ac.in/id/eprint/22717

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