Abstract
Crystal structure, thermochemical stability, transport and magnetic properties of compositions in the ( 100-x) La 0.8Sr 0.2MnO 3 ± δ xCeO 2 (LSMC) system were studied. All compositions in the LSMC series containing more than 2 mol% CeO 2 were two phase and consisted of the modified perovskite constituent with rhombohedral structure ( R3̄ c) and ceria as a secondary phase with cubic structure ( Fm3̄ m). The presence of both Ce 4+and Ce 3+ cations in LSMC compositions was revealed by X-ray Photoelectron Spectroscopy (XPS). CeO 2 and compositions in the LSMC series showed good thermochemical stability in air and argon. However, in H 2–Ar atmosphere all LSMC compositions underwent reduction followed by decomposition. Transport and magnetic properties change in a non-linear way with the increase in the CeO 2 content. The LSMC2 composition showed enhanced electronic conductivity and magnetic characteristics. Metallic type conductivity was observed for LSMC compositions with x ≤ 36 mol% CeO 2 in a narrow temperature range of 770–900 °C. A small degree of substitution of Ce into LSM was found to change structural, magnetic and electrical properties.
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