Abstract

Solid solution YCu_xMn_1 – xO₃ ceramics of with x = 0.05, 0.10, and 0.15 have been produced by the solid-phase reaction method with subsequent sintering by common ceramic technology. The structure, the microstructure, and the dielectric properties of the ceramics have been studied, including the measurements of the temperature–frequency dependences of the relative dielectric permittivity and the dielectric loss tangent, and also the electrical conductivity. It is found that the mainly hexagonal phase forms in the ceramics; in this case, their grain structures are inhomogeneous and their synthesis occurs with the formation of liquid phases of eutectic origin. It is shown that the anomalous behavior of the dielectric characteristics at T = 30–200°C in all these ceramics is related to the effects of the interlayer polarization, and at T = 222°C (x = 0.05), 234°C (x = 0.10), and 247°C (x = 0.15), with the “isostructural” transition that is intermediate one between the ferroelectric and paraelectric phases.

中文翻译：

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YCu x Mn 1-x O 3固溶陶瓷的结构，晶粒结构和介电性能

摘要

固溶YCU _X的Mn _{1 -  X} Ö ₃陶瓷的与X通过固相反应方法产生了0.05、0.10和0.15，随后通过普通的陶瓷技术进行了烧结。研究了陶瓷的结构，微观结构和介电性能，包括相对介电常数和介电损耗角正切以及电导率的温度-频率依赖性的测量。发现在陶瓷中形成了主要为六方相的相。在这种情况下，它们的晶粒结构是不均匀的，它们的合成是随着共晶起源的液相的形成而发生的。结果表明，在所有这些陶瓷中，T = 30–200°C时介电特性的异常行为与层间极化的影响以及在T时的情况有关。= 222°C（x = 0.05），234°C（x = 0.10）和247°C（x = 0.15），“同构”跃迁介于铁电相和顺电相之间。