Nano-BaTiO3 phase transition behavior in coated BaTiO3-based dielectric ceramics

被引：21

作者：

Chen, Cheng ^{[1
]}

Hao, Hua ^{[1
]}

Wang, Ting ^{[1
]}

Cheng, Jingsai ^{[2
]}

Luo, Zhiping ^{[1
]}

Zhang, Lin ^{[1
]}

Cao, Minghe ^{[1
]}

Yao, Zhonghua ^{[1
]}

Liu, Hanxing ^{[2
]}

机构：

[1] Wuhan Univ Technol, Sch Mat Sci & Engn, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China

[2] Wuhan Univ Technol, Int Sch Mat Sci & Engn, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2019年 / 45卷 / 06期

关键词：

BaTiO3; nanopowders; Phase transitions; Core-shell structure; Internal stress; GRAIN-SIZE; TEMPERATURE CHARACTERISTICS; INTERNAL-STRESS; PARTICLES; PRECIPITATION; PERMITTIVITY;

D O I：

10.1016/j.ceramint.2018.12.223

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：

In this work, the phase structure of BaTiO3 nanopowders produced by the alkoxide-hydroxide and the hydro thermal method, respectively, was systemically investigated. BaTiO3 nanopowders with cubic phase produced by the alkoxide-hydroxide method could transform to tetragonal phase when heated to about 1100 degrees C. Cubic to tetragonal phase transformation behavior of BaTiO3 nanopowders coated with 0.3BZT-0.7BT or 0.03Nb(2)O(5)-0.01Co(2)O(3) was studied. The internal stress within core-shell structure was proposed to explain the BaTiO3 phase transformation behaviors. The mismatch of thermal expansion coefficient between core and shell plays a crucial role in cubic to tetragonal phase transformation of BaTiO3. By tuning the composition of shell and the ratio of the shell to the core, the cubic BaTiO3 core can transform to tetragonal phase successfully after sintering at 1100 degrees C in BaTiO3 based ceramics with core-shell structure and it is mainly resulted by the reduced internal stress between the shell and core.

引用

页码：7166 / 7172

页数：7

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