Abstract—

We have prepared (1 – x)(K_0.5Na_0.5)NbO₃–xCa(Cu_1/3Nb_2/3)O₃ (x = 0–0.1, ∆х = 0.02) ceramics by solid-state reactions and studied their phase formation, structure, and dielectric and ferroelectric properties. The formation of a phase with the perovskite structure and an orthorhombic unit cell has been demonstrated in all of the samples. Ferroelectric phase transitions have been confirmed by dielectric spectroscopy and laser second harmonic generation measurements. The temperatures of the phase transitions from the orthorhombic ferroelectric phase to the tetragonal ferroelectric phase and to the cubic (paraelectric) phase have been shown to decrease with increasing x. We have analyzed the composition dependences of dielectric parameters in the system studied.

中文翻译：

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改性铌酸钾钠陶瓷的相形成，结构和介电性能

摘要—

我们准备了（1 – x）（K _0.5 Na _0.5）NbO ₃ – x Ca（Cu _1/3 Nb _2/3）O ₃（x = 0–0.1，∆х= 0.02）陶瓷通过固相反应并研究了它们的相形成，结构以及介电和铁电特性。在所有样品中都证明了具有钙钛矿结构和正交晶胞的相的形成。铁电相变已通过介电谱和激光二次谐波生成测量得到证实。从正交铁电相到四方铁电相和立方（顺电）相的相变温度已显示随着x的增加而降低。我们已经分析了所研究系统中介电参数的成分依赖性。