Thermochemistry of La0.7Sr0.3Mn1-xFexO3 solid solutions (0 < x < 1)

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. Published by Elsevier Inc.