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Gradually Varying Intermediate Valence of Fe in La1-xCaxFeO3

Published online by Cambridge University Press:  16 February 2011

Jiangong Li
Jiangong Li*
Affiliation:
Department of Materials Science, Lanzhou University, Lanzhou 730000, China, lijg@lzu.edu.cn
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Abstract

The isomer shift of La1-xCaxFeO3 decreases gradually from the value for trivalent iron to that for tetravalent iron, as the Ca content x increases from 0 to 1. This indicates that iron in La1-xCaxFeO3 has an intermediate valence state. The intermediate valence state of iron increases gradually from trivalence to tetravalence. This can be interpreted as being due to electron delocalization among iron ions on identical octahedral sites. The Mossbauer spectra at various temperatures of La0.5Ca0.5FeO3 and their theoretical treatment show that electron delocalization slows down with decreasing temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 547: Symposium DD – Solid-State Chemistry of Inorganic Materials II , 1998 , 51
Copyright
Copyright © Materials Research Society 1999

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