Abstract
The IR spectra of some LaNi 1− x B x O 3 ( 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 → x c from the insulating side has been carried out. An important feature is that as x → x c the vibrational features in the infrared spectra disappear when the resistivity is ∼10 −1 Ω cm which is of two orders of magnitude more than the value of ϱ 0 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 FeO overlap.
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