期刊
ACTA MATERIALIA
卷 57, 期 19, 页码 5667-5680出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2009.07.062
关键词
Perovskites; Thermoelectricity; Structural transition; Thermal reduction; Twinned domain microstructure
资金
- Swiss Federal Office of Energy
- Ministry of Education of the Czech Republic [LC 523]
Polycrystal line perovskite-type CaMn1-xNbxO3 phases (with x = 0.02, 0.05, 0.08 and 0.10) were investigated with regard to their structure, microstructure and thermal stability as a function of temperature. The studied phases revealed a complex microstructure at room temperature with 90 degrees twinned domains. At high temperatures, the manganate phases underwent a structural transition from orthorhombic to cubic symmetry, as confirmed by in situ high-temperature X-ray powder diffraction and electron diffraction data. Thermogravimetric heating/cooling studies showed a reversible thermal reduction/reoxidation process that occurred above a defined transition temperature. A possible mechanism relating the high-temperature structural transition and the thermal reduction process of slightly substituted CaMnO3 phases was proposed. The thermal reduction process resulted in a change in the Mn3+/Mn4+ concentrations in the Mn sublattice, and therefore in a modification of the transport properties. A comprehensive study examined the impact of both phenomena on the electrical and thermal transport properties. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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