Structure and electrical properties of single-phase cobalt manganese oxide spinels Mn3xCoxO4 sintered classically and by spark plasma sintering(SPS)

Cobalt manganese oxide spinels Mn3xCoxO4 (with 0.98pxp3) 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 paramet...

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Published in:Journal of solid state chemistry 2009-02, Vol.182 (2), p.396-401
Main Authors: Bordeneuve, Hélène, Guillemet, Sophie, Rousset, Abel, Schuurman, Sophie, Poulain, Véronique
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Guillemet, Sophie
Rousset, Abel
Schuurman, Sophie
Poulain, Véronique
description Cobalt manganese oxide spinels Mn3xCoxO4 (with 0.98pxp3) 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
doi_str_mv 10.1016/j.jssc.2008.11.004
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title Structure and electrical properties of single-phase cobalt manganese oxide spinels Mn3xCoxO4 sintered classically and by spark plasma sintering(SPS)
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