Properties of Perovskite-like Lanthanum Strontium Ferrite Ceramics with Variation in Lanthanum Concentration

The purpose of this work is to study the effect lanthanum (La) concentration on phase formation, conductivity, and thermophysical properties perovskite-like strontium ferrite ceramics. At same time, key difference from similar studies possibility obtaining two-phase composite ceramics, presence various phases in which will lead a change structural, strength, conductive properties. To obtain ceramics by mechanochemical solid-phase synthesis, method component molar ratio variation was used, which, when mixed, makes it possible different elements and, as result, vary composition Scanning electron microscopy, X-ray analysis, impedance spectroscopy were used research methods, combination made comprehensively synthesized Analysis changes depending can be written follows: (La0.3Sr0.7)2FeO4/LaSr2Fe3O8 ? (La0.3Sr0.7)2FeO4/LaSr2Fe3O8/Sr2Fe2O5 (La0.3Sr0.7)2FeO4/Sr2Fe2O5. Results showed that with an increase 0.10 0.25 mol value dielectric permittivity increases significantly 40.72 231.69, loss tangent 1.07 1.29 at frequency 10,000 Hz, electrical resistivity decreases × 108 2.37 107 ??cm.