Preparation and characterization of negative temperature coefficient (Ni,Mn)3O4–La(Mn,Ni)O3 composite
Preparation and characterization of negative temperature coefficient (Ni,Mn)3O4–La(Mn,Ni)O3 composite
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DOI：
10.1007/s10832-007-9375-0
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发表时间：
2008-04
影响因子：
1.7
通讯作者：
Chunhua Zhao;Zhongbing Wang;S. Wang;Pinghua Yang;Chusheng Chen
中科院分区：
文献类型：
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作者：
Chunhua Zhao;Zhongbing Wang;S. Wang;Pinghua Yang;Chusheng Chen
研究了尖晶石结构（Ni,Mn） o4与钙钛矿结构La(Mn,Ni) o3复合材料作为负温度系数（NTC）热敏电阻的应用前景。采用标准陶瓷工艺制备复合材料。复合材料在25℃时的电阻率根据低电阻钙钛矿相的数量下降了一到两个数量级，而决定NTC热敏电阻温度敏感性的热常数在4000 ~ 3000 K范围内仍然相当大，并且在空气中150℃退火1000 h后的电阻率漂移相对较小（约1.2%）。采用一般有效介质模型拟合复合材料的电阻率数据，得到钙钛矿相的渗透体积分数为0.37。这项工作表明，通过与低电阻率钙钛矿结构氧化物制备复合材料，可以调整尖晶石结构氧化物的电阻率和热常数。
The composites made of spinel-structured (Ni,Mn)3O4and perovskite-structured La(Mn,Ni)O3were investigated for potential application as negative temperature coefficient (NTC) thermistor. The composites were prepared using the standard ceramic route. The electrical resistivity of the composite at 25°C was found to decrease by one to two orders of magnitude depending the amount of the low-resistivity perovskite phase, while the thermal constant determining the temperature sensitivity of the NTC thermistor was still reasonably large in the range of 4,000 to 3,000 K, and the resistivity drift after annealing at 150°C for 1,000 h in air was relatively small (∼1.2%). The general effective media model was adopted to fit the electrical resistivity data of the composites, giving a value of 0.37 for the percolation volume fraction of the perovskite phase. This work demonstrates that it is possible to tune the electrical resistivity and thermal constant of the spinel-structured oxide through making composite with low-resistivity perovskite-structured oxide.