Thermochemistry of La_0.7Sr_0.3Mn_1-xFe _xO₃ solid solutions (0<x<1)

The structure, the energetics and the internal redox reactions of La _0.7Sr_0.3Fe_xMn_1-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 La_0.70Sr _0.30Fe_xMn_1-xO₃ solid solution. Published by Elsevier Inc.