Nonhydrolytic sol-gel synthesis and dielectric properties of ultrafine-grained and homogenized Ba0.70Sr0.30TiO3

被引：35

作者：

Mao, Chaoliang ^{[1
]}

Dong, Xianlin ^{[1
]}

Zeng, Tao ^{[1
]}

Chen, Heng ^{[1
]}

Cao, Fei ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 200050, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2008年 / 34卷 / 01期

关键词：

sol-gel; (Ba; Sr)TiO3; nanocrystalline; spark plasma sintering; dielectric property;

D O I：

10.1016/j.ceramint.2006.08.002

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A simple process has been investigated to synthesize nanocrystalline Ba0.70Sr0.30TiO3 (BST) powders via a nonhydrolytic sol-gel method by using barium acetate, strontium acetate, titanium tetrabutoxide, ethanol, acetic acid and acetylacetone as the starting materials. Thermogravimetry (TG) and differential thermal analysis (DTA) were used to examine the decomposition behaviour of the xerogel. The particle size of BST is close to 30 nm calculated by X-ray diffraction (XRD) and confirmed by transmission electron microscopy (TEM). Using these nanocrystalline BST powders, dense BST ceramics with ultrafine grains were obtained by spark plasma sintering (SPS). The grain size effect on the dielectric properties was studied. It was shown that as the grain size decreased, the transition temperature (T-c) and the dielectric constant decreased and the transition became diffuse. (C) 2006 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：45 / 49

页数：5

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