Abstract
The microstructure and dielectric properties of (K0.5Na0.5)NbO3–SrZrO3 were investigated. The dielectric constant is high and stable in a wide temperature range. The rate of change in dielectric constant is within ±10% in the temperature range from −55 to 200 °C. This effect is thought to be due to the core–shell structure composed of a K-rich shell and a Na-rich core, which have different Curie temperatures. This core–shell structure can be controlled on the basis of sintering temperature. The width of the K-rich shell of a sample sintered at 1250 °C is larger than that of a sample sintered at 1180 °C. In addition, the insulation resistance of this material is high at high temperatures. The specific resistance of this material is 109 Ω cm at 200 °C. This material can be used for high-temperature multilayer ceramic capacitors, which have stable capacitance and high reliability at high temperatures.
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