کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7880280 | 1509586 | 2015 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Core-shell grain structures and dielectric properties of Na0.5K0.5NbO3-LiTaO3-BiScO3 piezoelectric ceramics
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The origins of distinctive compositional dependence of relative permittivity, Ér, in the Pb-free piezoelectric system (1 â 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 â¼370 °C in Ér-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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 90, 15 May 2015, Pages 204-212
Journal: Acta Materialia - Volume 90, 15 May 2015, Pages 204-212
نویسندگان
Fangyuan Zhu, Michael B. Ward, Jing-Feng Li, Steven J. Milne,