Fabrication of high-sensitivity Bi0.2-xCexSr0.5La0.3TiO3 0<x<0.05 ceramics for high-temperature NTC thermistors
Fabrication of high-sensitivity Bi0.2-xCexSr0.5La0.3TiO3 0<x<0.05 ceramics for high-temperature NTC thermistors
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高灵敏度Bi0.2-xCexSr0.5La0.3TiO3 0的制备
DOI：
10.1016/j.jallcom.2020.156749
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发表时间：
2020
影响因子：
6.2
通讯作者：
Yiquan Wu
中科院分区：
文献类型：
--
作者：
Ting Liu;Xuan Chen;Huimin Zhang;Aimin Chang;Yiquan Wu
采用Pechini法合成了高密度负温度系数（NTC）热敏陶瓷Bi0.2-xCexSr0.5La0.3TiO3（0<x<0.05）（BCSLTO）。本文首次对BCLTO陶瓷优良的高温NTC特性进行了表征分析。BCSLTO NTC热敏电阻陶瓷具有300 °C-1000 °C的宽工作温度，且烧结条件温和，与常规的1250 °C烧结相比。BCSLTO陶瓷的重要电性能参数为：30 0 °C、70 0 °C和10 0 0 °C的电阻率分别为3.2 6 ×10 9 - 8.99 × 10 7 Ω·cm、2.2 1 ×10 5 - 1.0 5 × 10 5 Ω·cm和1.18×10 3 - 1.13 × 10 3 Ω·cm;热常数B 300/700为13385.9-9408.8 K，活化能Ea 300/700为1.15-0.81 eV。通过掺杂Ce，可以在很大范围内控制电阻率和热常数B。此外，电阻率漂移随着Ce掺杂含量的增加（低于5%）而改善。Bi0.2-xCexSr0.5La0.3TiO3高温陶瓷材料具有烧结条件温和、工作温度宽、高温稳定性好等特点，可作为高温、恶劣环境下的理想陶瓷材料。
High density negative temperature coefficient (NTC) thermistor ceramics Bi 0.2-x Ce x Sr 0.5 La 0.3 TiO 3 (0<x<0.05) (BCSLTO) were synthesized by the Pechini method. This work is the first to characterization analysis the excellent NTC characteristics of BCSLTO ceramics at high temperatures. BCSLTO NTC thermistor ceramics have wide operating temperature is 300 °C–1000 °C, and mild sintering conditions with the conventional sintering at 1250 °C. The important electrical performance parameters of BCSLTO ceramics are as follows: the resistivities at 300 °C, 700 °C, and 1000 °C are 3.26×10 9 –8.99×10 7 Ω·cm, 2.21×10 5 –1.05×10 5 Ω·cm, and 1.18×10 3 –1.13×10 3 Ω·cm, respectively; the thermal constant B 300/700 is 13385.9–9408.8 K; the activity energy Ea 300/700 is 1.15–0.81 eV. The resistivity and the thermal constant B can be widely control by doping Ce. In addition, the resistivity drift improves as the Ce doping content increases (below 5%). The new high-temperature Bi 0.2-x Ce x Sr 0.5 La 0.3 TiO 3 ceramic materials with mild sintering conditions, wide operating temperature and high-temperature stability can be used as potential candidates for high temperatures and harsh environments.