Crystal structure, thermochemical stability, transport and magnetic properties of compositions in the (100-x) La0.8Sr0.2MnO3 ± δ xCeO2 (LSMC) system were studied. All compositions in the LSMC series containing more than 2 mol% CeO2 were two phase and consisted of the modified perovskite constituent with rhombohedral structure (R3̄c) and ceria as a secondary phase with cubic structure (Fm3̄m). The presence of both Ce4+and Ce3+ cations in LSMC compositions was revealed by X-ray Photoelectron Spectroscopy (XPS). CeO2 and compositions in the LSMC series showed good thermochemical stability in air and argon. However, in H2-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 CeO2 content. The LSMC2 composition showed enhanced electronic conductivity and magnetic characteristics. Metallic type conductivity was observed for LSMC compositions with x ≤ 36 mol% CeO2 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.
- Electronic conductivity and magnetization
- Two-phase composite
- X-ray Photoelectron Spectroscopy (XPS)
ASJC Scopus subject areas
- Chemistry (all)
- Materials Science (all)
- Condensed Matter Physics