Abstract In this study, pellet samples of (Na0.5K0.5)1-yLiyNbO3, (NKLN) y ≤ 0.06, were prepared using a conventional solid-state reaction method with double sintering. The temperature-dependent dielectric constant and high-temperature X-ray diffraction characteristics of the prepared compositions were observed. Four consistent distinct phases were determined according to the observations as follows. For the compositions where y ≤ 0.02, the phases exhibited monoclinic symmetry between room temperature and about 200 °C, tetragonal between about 200 °C and 400 °C, tetragonal with different symmetry between about 400 °C and 460 °C (the so-called X phase), and cubic symmetry above about 460 °C. For the compositions with higher Li concentrations (y) between 0.03 ≤ y ≤ 0.06, the X phase was not observed and two distinct phase transitions were observed from monoclinic to tetragonal at around 200 °C, and from tetragonal to cubic at around 460 °C.

中文翻译：

---

Li掺杂(Na, K) NbO3在同形相区附近的温度相关介电和结构特性

摘要 在本研究中，(Na0.5K0.5)1-yLiyNbO3, (NKLN) y ≤ 0.06 的球团样品采用常规固相反应方法和双烧结制备。观察了制备的组合物的温度依赖性介电常数和高温X射线衍射特性。根据如下观察确定四个一致的不同相。对于 y ≤ 0.02 的组合物，在室温和约 200 °C 之间呈现单斜对称，在约 200 °C 和 400 °C 之间呈现四方对称，在约 400 °C 和 460 °C 之间呈现不同对称性的四方对称（所以-称为 X 相），并且在约 460 °C 以上具有立方对称性。对于具有介于 0.03 ≤ y ≤ 0.06 之间的较高锂浓度 (y) 的组合物，