摘要
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.
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