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Hélène Bordeneuve Sophie Guillemet-Fritsch Sophie Schuurman 《Journal of solid state chemistry》2009,182(2):396-401
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. 相似文献
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