Abstract—

Single-phase (1 – x)(K_0.5Na_0.5)NbO₃⋅xBaZrO₃ (x = 0–0.06) ceramics with new compositions, including those modified with SiO₂ and ZnO oxide additions, have been prepared and their crystal structure, microstructure, and dielectric and nonlinear optical properties have been studied. A phase with the perovskite structure and an orthorhombic unit cell has been shown to form in all of the synthesized materials. Partial replacement of cations of the basic composition by cations of the combined additive has been demonstrated to cause an increase in unit-cell volume. The ferroelectric phase transitions in the ceramics have been confirmed by dielectric spectroscopy and laser radiation second harmonic generation measurements. Doping with SiO₂ and ZnO oxide additions has been shown to lower the temperatures of the transitions from the orthorhombic ferroelectric phase to a tetragonal ferroelectric one and then to a cubic paraelectric phase.

中文翻译：

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(K0.5Na0.5)NbO3–BaZrO3 陶瓷的制备、结构及其介电和非线性光学性能

摘要-

具有新成分的单相 (1 – x )(K _0.5 Na _0.5 )NbO ₃ ⋅ x BaZrO ₃ ( x = 0–0.06) 陶瓷，包括用 SiO _{2改性的陶瓷}制备了ZnO氧化物添加剂，并研究了它们的晶体结构、微观结构以及介电和非线性光学性质。所有合成材料中都显示出具有钙钛矿结构和斜方晶胞的相。已证明用组合添加剂的阳离子部分替代基本组合物的阳离子会引起晶胞体积的增加。陶瓷中的铁电相变已通过介电谱和激光辐射二次谐波产生测量得到证实。添加SiO ₂和ZnO氧化物的掺杂已被证明可以降低从斜方铁电相到四方铁电相然后到立方顺电相的转变温度。