High-temperature capacitors were prepared by the conventional oxide method based on Bi0.5Na0.5TiO3-BaTiO3-CaTiO3 (BNT-BT-CT) lead-free piezoelectric ceramics. BNT-BT is one of the promising candidates as a high-temperature relaxor, and has a high Curie temperature and broadened dielectric constant. The addition of CT increases the dielectric constant at lower temperatures and decreases the dielectric constant at higher temperatures, so that the variation of capacitance is decreased. The effect of BT on the temperature characteristic of dielectric constant is contrary to that of CT. A single-phase rhombohedral perovskite and square grains were obtained in this study. With the proper amount of BT and CT additions, the high-temperature specification can be met: from −55°C to 200°C, the variation of capacitance is within ±15% of room-temperature capacitance.
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Yuan, Y., Zhou, X.H., Zhao, C.J. et al. High-Temperature Capacitor Based on Ca-Doped Bi0.5Na0.5TiO3-BaTiO3 Ceramics. J. Electron. Mater. 39, 2471–2475 (2010). https://doi.org/10.1007/s11664-010-1246-9
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DOI: https://doi.org/10.1007/s11664-010-1246-9