期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 182, 期 2, 页码 396-401出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2008.11.004
关键词
Cobalt manganese oxide; Spinels; SPS sintering; Thermal history; Electrical properties; Thermistors
Cobalt manganese oxide spinels Mn3-xCoxO4 (with 0.98 <= x <= 3) were prepared by the thermal decomposition in air of oxalate precursors. The influence of the thermal treatments on the structure of these materials is emphasized. Single-phase ceramics were obtained after optimization of the sintering parameters. A precise phase diagram for the Co-Mn-O system is proposed according to thermal stability and structure of oxide powders. The electrical measurements on single-phase ceramics show that low values of resistivity can be achieved. The conduction could take place through jumps of polarons between Mn3+ and Mn4+ on octahedral sites. These compounds present interesting electrical characteristics for negative temperature coefficient (NTC) thermistor applications. (C) 2008 Elsevier Inc. All rights reserved.
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