High-stability solid solution perovskite (1-x) Bi 0.2 Sr 0.5 La 0.3 TiO 3 - xLaMnO 3 (0.05≤ × ≤0.2) for wide-temperature NTC thermistors.

The development of negative temperature coefficient (NTC) thermistor materials with a wide range of operating temperatures, high resistance (R), low thermal content (B) and good stability is significant for improving the overall performance of NTC thermistors. Traditional NTC thermistors materials are of the spinel, however, their practical applications are commonly limited to temperatures below approximately 200°C.In this study, it was found that a novel perovskite-structured solid solution (1-x)Bi _0.2 Sr _0.5 La _0.3 TiO ₃ -xLaMnO ₃ (0.05 ≤ × ≤ 0.2) (BSLT-LM) showed good NTC performance from room temperature to high temperature (600°C) due to the stable structure at high temperatures. The ρ ₂₅ , ρ ₁₀₀ , ρ ₆₀₀ and B _25/100 , B _25/600 constants of Bi _0.2 Sr _0.5 La _0.3 TiO ₃ -0.1LaMnO ₃ NTC thermistors are approximately 1.76 × 10 ⁸  Ω cm, 1.13 × 10 ⁷  Ω cm, 9.89 × 10 ²  Ω cm, 4063.91 K, 5472.34 K, respectively. The electrical conductivity of these solid solution refers to the electronic transition between Mn ³⁺ and Mn ⁴⁺ , and oxygen vacancies. These results demonstrate the tremendous potential of perovskite-structured (1-x) Bi _0.3 Sr _0.5 La _0.2 TiO ₃ -xLaMnO ₃ thermistor ceramics with NTC performance.
Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
(Copyright © 2023 Liu, Yang, Ma, Zhang, Zhang and Chang.)