Low temperature coefficient of resistance and high conductivity: Enhanced Cu–substituted LaCo0.4Ni0.6O3 ceramics for functional material. Issue 19 (1st October 2022)

• Record Type: Journal Article
• Authors: Lu, Yongcheng; Li, Yuanxun; Peng, Rui; Shi, Liang; Li, Fuyu; Chen, Daming; Wen, Qiye; Yang, Chengtao; Yang, Qinghui
• Is Part Of: Ceramics international. Volume 48:Issue 19(2022)Part A
• Page Start: 27899
• Page End: 27904
• Publication Date: 2022-10-01
• Subjects: Functional material -- Thick film resistors -- Low TCR -- High conductivity; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.06.093
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The LaCo0.4 Ni0.6-y Cuy O3 (LCNCu, y = 0.02–0.08) ceramics were prepared and their possibility as a cheap alternative functional material for thick film resistors was studied. Scanning electron microscopy, differential–thermal and thermomechanical analyses showed that the incorporation of Cu 2+ lowered the densification temperature and enhanced the compactness of LCNCu ceramics. All of the samples revealed relatively high conductivity. When y < 0.05, both Cu 2+ substitution and sintering temperature showed a strong influence on the conductivity of LCNCu ceramics. However, the simulation results indicated that the density of states almost did not change after Cu 2+ substitution despite the weakened electron transport. The temperature coefficient of resistance (TCR) gradually decreased with the addition of Cu 2+ . Low TCR values (absolute values < 300 ppm/°C) and high conductivity were realized for the samples with y ≤ 0.04 sintered at 1200 °C and y = 0.02 sintered at 1225 °C. Consequently, the improved LaCo0.4 Ni0.6-y Cuy O3 ceramics may be a potential economical functional material for thick film resistors.