High-temperature capacitor materials sintered at 1120°C were prepared in a BaTiO 3 (BT)-Na 0.5 Bi 0.5 TiO 3 (NBT)-Nb 2 O 5 -ZnO-CaZrO 3 system. The Curie temperature of BaTiO 3 was increased by NBT doping, and a secondary phase occurred when adding ‡5 mol% NBT. The effects of Nb 2 O 5 , ZnO, and CaZrO 3 on the dielectric properties and the microstructure of BT ceramics doped with 1 mol% NBT were analyzed. The overall dielectric constant decreased when the Nb 2 O 5 content increased, and increased when the ZnO content increased. The dielectric constant peak at the Curie temperature was effectively depressed, and a broad secondary dielectric constant peak appeared at 60°C when the ZnO concentration was ‡4.5 mol%. Significant grain growth was observed by scanning electron microscope (SEM) analysis as the amount of ZnO increased. The high-temperature capacitor specification (À55°C to +175°C, DC/C 25°C less than ±15%) is met when 7 mol% to 8 mol% CaZrO 3 is added.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.