Concentration Dependences of Electronic and Magnetic Properties of Nonstoichiometric Ferrite Doped with Manganese

Using the coherent potential method, trends in the variation of the electronic spectrum and local magnetic moment on iron and manganese ions in La0.5Sr0.5Fe _1 - y MnуO _3 - z and La0.5Sr0.5Fe0.75Mn0.10Co0.15O _3 - z nonstoichiometric solid solutions with 0.1 ≤ y ≤ 0.3 and 0.05 ≤ z ≤ 0.35 were established. The concentration dependences of the electronic properties of La0.5Sr0.5Fe _1 - y MnуO _3 - z in the homogeneity region correlate well with the experimental data. It is shown that the compounds La0.5Sr0.5Fe0.7Mn0.3 O_2.65-2.95 and La0.5Sr0.5Fe0.75Mn0.10Co0.15 O_2.65-2.95 , which have metallic-type electron spectrum and redox transitions Fe4+/Fe3+, Mn4+/Mn3+, Mn3+/Mn2+, Сo4+/Co3+, and Co2+/Co+, are promising electrode materials.