Structure and electrical properties of single-phase cobalt manganese oxide spinels Mn3-xCoxO4 sintered classically and by spark plasma sintering (SPS)

被引：102

作者：

Bordeneuve, Helene ^{[1
]}

Guillemet-Fritsch, Sophie ^{[1
]}

Rousset, Abel ^{[1
]}

Schuurman, Sophie ^{[2
]}

Poulain, Veronique ^{[2
]}

机构：

[1] Univ Toulouse 3, CNRS, CIRIMAT, UMR 5085, F-31062 Toulouse 4, France

[2] Vishay BC Components, B-1140 Brussels, Belgium

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2009年 / 182卷 / 02期

关键词：

Cobalt manganese oxide; Spinels; SPS sintering; Thermal history; Electrical properties; Thermistors; NEUTRON DIFFRACTION; MAGNETIC PROPERTIES; MNCO2O4; FILMS; TEMPERATURE; MNXCO3-XO4; DISTANCES; CO3O4; MANGANITES; CERAMICS; CRYSTALS;

D O I：

10.1016/j.jssc.2008.11.004

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

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.

引用

页码：396 / 401

页数：6

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