Structure and electrical properties of Pr6O11-doped CaCu3Ti4O12 NTC ceramics

Zuo, Yang; Tian, Jian; Tian, Yuxin; Miao, Guangtan; Fu, Peng; Zuo, Yang; Tian, Jian; Tian, Yuxin; Miao, Guangtan; Fu, Peng

doi:2023.60.3.496

J. Korean Ceram. Soc. > Volume 60(3); 2023 > Article

Original Article

Journal of the Korean Ceramic Society 2023;60(3): 496-510.
doi: https://doi.org/10.1007/s43207-022-00280-3

Structure and electrical properties of Pr₆O₁₁-doped CaCu₃Ti₄O₁₂ NTC ceramics

Yang Zuo^1,2, Jian Tian¹, Yuxin Tian², Guangtan Miao³, Peng Fu³

¹School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, People’s Republic of China
²School of Information and Electronics; Shandong University Key Laboratory of Perception Technology and Control, Shandong Technology and Business University, Yantai 264005, People’s Republic of China
³School of Materials Science and Engineering, Liaocheng University, Liaocheng 252000, People’s Republic of China

Correspondence

Yang Zuo ,Email: 201513395@sdtbu.edu.cn
Jian Tian ,Email: jiantian@sdust.edu.cn
Peng Fu ,Email: fupeng@lcu.edu.cn

Received: June 9, 2022; Revised: November 23, 2022 Accepted: December 8, 2022. Published online: January 4, 2023.

ABSTRACT

The xPr₆O₁₁–(1 − x )CaCu₃Ti₄O₁₂ (CCTO) ceramics with perovskite structure were prepared by the solid-state reaction method. The effects of Pr₆O₁₁ addition on the microstructure and electrical properties of the CCTO ceramics were studied. The addition of Pr₆O₁₁ promoted the sintering of CCTO ceramics, and the mean grain sizes increased gradually from 2.13 to 5.08 μm with increasing Pr₆O₁₁ content. All the samples had noticeable negative temperature coeffi cient (NTC) effect, and both the grain and grain boundary effects contributed to their NTC characteristics. The thermistor characteristic parameter B_25/75 decreased from 6883 to 5291 K as Pr₆O₁₁ contents increased from 0.00 to 0.08. The analysis shows that the conductivity of Pr 6 O 11 –CCTO ceramics arises mainly from the electron hopping transport mechanism. The GB resistances are noticeably higher than grain resistances at the same Pr₆O₁₁ content. All the samples showed electrical relaxation behavior. The above observations indicate that the structures and electrical properties of CCTO ceramics can be attuned precisely by adjusting the Pr₆O₁₁ concentration.

Key words: CaCu₃Ti₄O₁₂ ceramics · Microstructure · NTC eff ect · Electrical properties