Effects of Ta2O5 on the microstructure and electrical properties of ZnO linear resistance ceramics. (1st January 2022)

• Record Type: Journal Article
• Authors: Zhuo, Meizhen; Huang, Chun-e; Zhao, Changzhi; Yin, Jiongjiong; Shen, Chunying
• Is Part Of: Materials research express. Volume 9:Number 1(2022)
• Publication Date: 2022-01-01
• Subjects: Ta2O5; doping -- effects -- microstructure -- stability -- electrical properties; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/ac4a2f
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: ZnO linear resistance ceramics were synthesized from ZnO–Al2 O3 –MgO–TiO2 –SiO2 –Ta2 O5 by a conventional ceramics method. Effects of Ta2 O5 on the phase composition, microstructures, and electrical properties of ZnO linear resistive ceramics were investigated. The results show that doping with appropriate amount of Ta2 O5 can refine the grains of the main crystalline phase ZnO and the secondary crystalline phase ZnAl2 O4 in terms of microstructure, and also can reduce the grain boundary barrier and optimize the I–V characteristics in terms of electrical properties. In addition, the doping of Ta2 O5 can improve the stability of the resistivity, and the impedance frequency indicates that the doping of Ta2 O5 makes the sample suitable for high-frequency electric fields. The resistivity of the sample doped with 0.2 mol% Ta2 O5 is 56.2 Ω·cm, and this sample has the best grain boundary barrier height, nonlinear coefficient and temperature coefficient of resistance of 0.054 eV, 1.04 and −3.48 × 10 −3 °C −1, respectively.