Mn-Co-Zn-O体系制备低阻高B型单层片式NTCR

The Preparation of Mn-Co-Zn Oxide for Monolayer Chip NTC Thermistors with Low Resistance and High B Constant

摘要: 研究了Mn-Co-O体系通过掺入适量ZnO,采用最佳的烧结温度,可制备低阻高B型NTCR(负温度系数热敏电阻),并通过XRD、SEM研究了样品Mn_1.14Co_1.83Zn_0.03O₄在不同烧结温度下的微观结构和电学特性。结果表明:Mn-Co-Zn-O体系在T=1100～1200℃很宽的温度范围可只存在尖晶石结构,同时具有高的激活能。样品Mn_1.14Co_1.83Zn_0.03O₄在烧结温度T=1100℃时存在最小电阻率,而B仍保持在4046K左右。因此,由其制成的单层片式NTCR可替代某些具有内电极的叠层器件。

Abstract: Series of Mn-Co-O NTC ceramics with the relatively low electrical resistivity and high B constant were obtained by adding ZnO and controlling sintering temperature.The microstructure and electrical properties of Mn_1.14Co_1.83Zn_0.03O₄ ceramics were investigated at different sintering temperature.The results indicate that the samples exhibited the high activation energy and formed mono-spinel oxide at the temperature of 1100～1200℃.Also,at a given 1100℃,the resistivity decreased to a minimum value,but a value of 4046K of the B constant was maintained.So the Mn_1.14Co_1.83Zn_0.03O₄ thermistors could be applied to single chip temperature sensor instead of some multilayer NTC thermistors with inner electrodes.