AUTHOR=Liu Ting , Yang Guanghua , Ma Juan , Zhang Huimin , Zhang Min , Chang Aimin 

TITLE=High-stability solid solution perovskite (1-x) Bi0.2Sr0.5La0.3TiO3- xLaMnO3 (0.05≤ × ≤0.2) for wide-temperature NTC thermistors

JOURNAL=Frontiers in Chemistry

VOLUME=11

YEAR=2023

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2023.1275274

DOI=10.3389/fchem.2023.1275274

ISSN=2296-2646

ABSTRACT=<p>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<sub>0.2</sub>Sr<sub>0.5</sub>La<sub>0.3</sub>TiO<sub>3</sub>-xLaMnO<sub>3</sub> (0.05 ≤ <italic>×</italic> ≤ 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<sub>25</sub>, ρ<sub>100</sub>, ρ<sub>600</sub> and B<sub>25/100</sub>, B<sub>25/600</sub> constants of Bi<sub>0.2</sub>Sr<sub>0.5</sub>La<sub>0.3</sub>TiO<sub>3</sub>-0.1LaMnO<sub>3</sub> NTC thermistors are approximately 1.76 × 10<sup>8</sup> Ω cm, 1.13 × 10<sup>7</sup> Ω cm, 9.89 × 10<sup>2</sup> Ω cm, 4063.91 K, 5472.34 K, respectively. The electrical conductivity of these solid solution refers to the electronic transition between Mn<sup>3+</sup> and Mn<sup>4+</sup>, and oxygen vacancies. These results demonstrate the tremendous potential of perovskite-structured (1-x) Bi<sub>0.3</sub>Sr<sub>0.5</sub>La<sub>0.2</sub>TiO<sub>3</sub>-xLaMnO<sub>3</sub> thermistor ceramics with NTC performance.</p>