In this work, piezoceramics of (1− x )(Bi 0.5 Na 0.5 )TiO 3 – x (K 0.5 Na 0.5 )NbO 3 , (1− x )BNT– x KNN, in the compositional range 0.00 ≤ x ≤ 0.07, were prepared by a mechanochemically activated solid-state method. The structural phase formation and microstructural, dielectric, and ferroelectric properties were studied. Although changes, in symmetry of the perovskite structure, were not detected with the composition (i.e., from a perspective of its intrinsic properties), the microstructural evolution was strongly dependent on the content of the KNN phase (i.e., based on its extrinsic properties). Specifically, KNN favoured the formation of a microstructure with cubic grains, typical morphology of the alkaline niobate ceramics. After KNN addition, both the maximum permittivity temperature and the long-range to short-range ordered transition temperature were reduced. Additionally, ferroelectric loops and strain deformation curves also reflect the long-range to short-range order evolution with KNN addition and temperature.

中文翻译：

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(1−x)(Bi0.5Na0.5TiO3)–xK0.5Na0.5NbO3压电陶瓷的介电和铁电性能演变

在这项工作中，(1− x )(Bi 0.5 Na 0.5 )TiO 3 – x (K 0.5 Na 0.5 )NbO 3 ，(1− x )BNT– x KNN 的压电陶瓷，在0.00 ≤ x ≤ 0.07 的组成范围内，由机械化学活化的固态方法制备。研究了结构相的形成和微观结构、介电和铁电特性。尽管钙钛矿结构的对称性变化未随成分检测到（即，从其内在特性的角度来看），但微观结构的演变强烈依赖于 KNN 相的含量（即，基于其外在特性） . 具体而言，KNN 有利于形成具有立方晶粒的微观结构，这是碱性铌酸盐陶瓷的典型形态。KNN加法后，最大介电常数温度和长程到短程有序转变温度均降低。此外，铁电回路和应变变形曲线也反映了 KNN 添加和温度的长程到短程有序演化。