Thermochemistry of La0.7Sr0.3Mn1−xFexO3 solid solutions (0<x<1) |
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Authors: | Nihan Kemik Yayoi Takamura |
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Institution: | a Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616, United States b Peter A. Rock Thermochemistry Laboratory and Nanomaterials in the Environment, Agriculture & Technology Organized Research Unit (NEAT ORU), University of California, Davis, CA 95616, United States |
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Abstract: | The structure, the energetics and the internal redox reactions of La0.7Sr0.3FexMn1−xO3 have been studied in the complete solid solution range 0.0<x<1.0. High temperature oxide melt drop solution calorimetry was performed to determine the enthalpies of formation from binary oxides and the enthalpy of mixing. There is a noticeable change in the energetics of the solid solution near x=0.7, which is due to the growing concentration of Fe4+ at higher Fe/(Fe+Mn) ratio. The balance between different valences of the transition metals, Mn and Fe, is the main factor in determining the energetics of the La0.70Sr0.30FexMn1−xO3 solid solution. |
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Keywords: | Perovskite Transition metal oxide (La Sr)MnO3 (La Sr)FeO3 Calorimetry Thermodynamics |
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