| Dynamic Electronic Structure in Transition Metal Oxides |
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| 作者姓名： | Jiangong Li |
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| 作者单位： | Department of Materials Science, Lanzhou University, Lanzhou 730000 |
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| 基金项目： | The NationalNatural Science Foundation of China (NSFC) and the Excellent Young Teacher Foundation of the Chinese Education Ministry are thanked for financial support;; |
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| 摘 要： | 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.x-CaxFeO3 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.
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