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首页> 外文OA文献 >Core-shell Grain Structures and Dielectric Properties of Na0.5K0.5NbO3-LiTaO3-BiScO3 Piezoelectric Ceramics.
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Core-shell Grain Structures and Dielectric Properties of Na0.5K0.5NbO3-LiTaO3-BiScO3 Piezoelectric Ceramics.

机译：Na0.5K0.5NbO3-LiTaO3-BiscO3压电陶瓷的核壳晶粒结构和介电性能。

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摘要

The origins of distinctive compositional dependence of relative permittivity, ɛr, in the Pb-free piezoelectric system (1-x)Na0.5K0.5NbO3-xLiTaO3, x≤ 10 mol.% modified with BiScO3 have been revealed using transmission electron microscopy with energy dispersive X-ray analysis (TEM-EDX). As the LiTaO3 content increased the Curie peak at ~370°C in ɛr –T plots became more diffuse, and at x= 5 mol.% an additional higher temperature peak occurred. TEM-EDX analysis showed the change in dielectric properties at x= 5 mol.% was due to a change in microstructure: micron-scale grains were replaced by submicron grains exhibiting core-shell chemical segregation. The outer shell was similar to the target solid solution composition, slightly enriched in Bi, Sc and Ta, whilst the core approximated to (Na, K, Li)NbO3 and was responsible for the additional dielectric peak. Examples of a novel three-tier metastable grain structure were observed for certain compositions.
机译：使用能量透射电子显微镜揭示了在无铅压电体系（1-x）Na0.5K0.5NbO3-xLiTaO3（x≤10 mol。％）中被BiScO3修饰的相对介电常数ɛr的独特成分依赖性的起源。色散X射线分析（TEM-EDX）。随着LiTaO3含量的增加，在ɛr–T图中，居里峰在〜370°C处变得更加分散，在x = 5 mol。％处出现了另一个更高的温度峰。 TEM-EDX分析表明，x = 5 mol。％时介电性能的变化是由于微观结构的变化：微米级晶粒被表现出核-壳化学偏析的亚微米晶粒所代替。外壳类似于目标固溶体成分，略微富含Bi，Sc和Ta，而核心近似于（Na，K，Li）NbO3，并负责附加的介电峰。对于某些组成，观察到新型三层亚稳晶粒结构的实例。

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