Abstract Piezoceramic Na0.685K0.315Nb1–yTayO3 (NKNT) (where y ≤0.05) samples were prepared via a solid-state reaction using double sintering. The effects of Ta-doping on the phase structure and electrical properties of the NKNT ceramics were investigated. The temperature dependence of the dielectric constant, loss tangent, and dielectric conductivity of the prepared samples was measured from RT to 500 °C at 10 kHz and 1 MHz. High temperature X-ray diffraction (HT- XRD) measurements were carried out on the prepared samples between RT and ∼200 °C, 200 and 380 °C, 380 and 460 °C, and above 460 °C, which showed monoclinic, tetragonal, tetragonal, and cubic phases, respectively. In Na0.685K0.315Nb1–yTayO3, all the transition peaks were observed to gradually shift towards lower temperatures upon increasing the Ta concentration at y ≤0.05 in the temperature range from RT to 500 °C.

中文翻译：

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无铅 Na0.685K0.315Nb1–yTayO3 (0 ≤ y ≤ 0.05) 陶瓷的结构和电学特性

摘要 压电陶瓷 Na0.685K0.315Nb1–yTayO3 (NKNT)（其中 y ≤0.05）样品是通过固态反应使用双烧结制备的。研究了Ta掺杂对NKNT陶瓷的相结构和电性能的影响。在 10 kHz 和 1 MHz 下测量了从室温到 500 °C 的制备样品的介电常数、损耗角正切和介电电导率的温度依赖性。对制备的样品进行了高温 X 射线衍射 (HT-XRD) 测量，温度介于 RT 和 ~200 °C、200 和 380 °C、380 和 460 °C 以及 460 °C 以上，结果显示单斜晶系、四方晶系，四方和立方相，分别。在 Na0.685K0.315Nb1–yTayO3 中，随着 y ≤ 0 处的 Ta 浓度的增加，所有的转变峰都被观察到逐渐向低温移动。