Abstract There has been recently a great progress in the development of dielectric capacitors for high temperature electronic applications. The design of lead-free ceramics with high dielectric permittivity, low dielectric loss and a limited variation of these parameters over a wide temperature range is still a big challenge. In this work, lead-free Bi0.35Na0.65–0.5xRb0.5xTi0.7Nb0.3O3 (x = 0–0.05) bulk ceramics were prepared using the solid-state reaction method. Upon Rb substitution, the variation of the dielectric permittivity was reduced substantially, in particular, at high temperature (over 200 °C). In addition, a low temperature coefficient of capacitance (TCC ≤ 10%) together with an ultra-low dielectric loss (tanδ ≤ 0.05) were achieved for the Bi0.35Na0.63Rb0.02Ti0.7Nb0.3O3 sample in the temperature range from −43 °C to 292 °C. The new relaxor-type ferroelectrics also possess the outstanding stability of the dielectric properties under high DC bias voltage, which makes them promising materials for high-performance capacitors of the next generation.

中文翻译：

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具有超高热稳定性的用于介电电容器的钙钛矿Bi0.5Na0.5TiO3基材料

摘要 最近，用于高温电子应用的介电电容器的开发取得了很大进展。设计具有高介电常数、低介电损耗和这些参数在较宽温度范围内变化有限的无铅陶瓷仍然是一个巨大的挑战。在这项工作中，使用固态反应方法制备了无铅 Bi0.35Na0.65–0.5xRb0.5xTi0.7Nb0.3O3 (x = 0–0.05) 块状陶瓷。Rb 取代后，介电常数的变化显着降低，特别是在高温（超过 200°C）下。此外，Bi0.35Na0.63Rb0.02Ti0.7Nb0.3O3 样品在 - 的温度范围内实现了低电容温度系数（TCC ≤ 10%）和超低介电损耗（tanδ ≤ 0.05）。 43°C 至 292°C。