Effect of pre-calcination of Bi2O3 and Sb2O3 on the densification and varistor properties of low-temperature sintered ZnO-Bi2O3 ceramics

This study utilized a conventional solid-state reaction method to sinter Bi2O3-Sb2O3-Co3O4-Mn3O4-Nb2O5 zinc oxide varistors at low temperatures of 860–880 °C. The pyrochlore phase occurs at temperatures ranging from 700 to 900 °C, influencing densification kinetics. The liquid-phase former, Bi2O3, is consumed and reacts to form the pyrochlore secondary phase Zn2Bi3Sb3O14, which inhibits the densification at low temperatures. Bi2O3 and Sb2O3 were pre-calcined at 550 °C to reduce secondary phase Zn2Bi3Sb3O14\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${Zn}_{2}{Bi}_{3}{Sb}_{3}{O}_{14}$$\end{document} formation and Bi2O3 consumption in this study. It was observed that pre-calcination of Bi2O3 and Sb2O3 at 550 °C successfully reduced the formation of the secondary phase Zn2Bi3Sb3O14, lowered the densification temperature of the ZnO-Bi2O3 varistor and improved its performance.