Core-Shell Structure and Dielectric Properties of Ba0.6Sr0.4TiO3@ Fe2O3 Ceramics Prepared by Co-Precipitation Method

Ba0.6Sr0.4TiO3 (BST) ceramic materials have been widely used in the field of multilayer ceramic capacitors. Surface modification through the surface coating to form a heterogeneous layer could effectively improve the dielectric properties. In this work, BST powders were prepared by a co-precipitatio...

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Bibliographic Details
Published in:Crystals (Basel) 2021-06, Vol.11 (6), p.623
Main Authors: Li, Zhuo, Wang, Chenbo, Wang, Zixuan, Zhang, Dandan, Qin, Yangxiao, Yang, Qiangbin, Wang, Zhuo, Zhao, Peng, Ma, Xinshuai, Li, Minghan, Ai, Tao, Yan, Xin, Niu, Yanhui, Peng, Biaolin, Sun, Shikuan, Wang, Dawei
Format: Article
Language:English
Subjects:
Ba0.6Sr0.4TiO3
Ceramic coatings
Ceramics
Chemical composition
Chemical precipitation
co-precipitation
Coprecipitation
Core-shell structure
Dielectric properties
Ethanol
Ferroelectricity
Microstructure
Morphology
Multilayers
Nitrates
Phase transitions
Photocatalysis
Scanning electron microscopy
Solid phases
Solid solutions
Spectrum analysis
Transition temperature
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Summary:Ba0.6Sr0.4TiO3 (BST) ceramic materials have been widely used in the field of multilayer ceramic capacitors. Surface modification through the surface coating to form a heterogeneous layer could effectively improve the dielectric properties. In this work, BST powders were prepared by a co-precipitation method. The effects of reaction conditions on the microstructure of the BST powder were investigated. The reaction temperatures significantly affected the morphology of BST powder, and the rhombic-type particles were obtained with the reaction temperature around 80 °C. Meanwhile, the BST@Fe2O3 was prepared by the chemical precipitation method using BST powders with rhombic-type microstructure as “core”, and the so-called “core-shell” microstructure was confirmed in the BST@Fe2O3 powder. Then, BST@x wt%Fe2O3 (x = 2.5, 5, 7.5, and 10, denoting the different content of Fe2O3) ceramics were further prepared, and the influence of “core-shell” structure on the phase structure, microstructure, and dielectric properties was investigated. With the increasing of Fe2O3 content, the ferroelectric–paraelectric phase transition temperature shifts toward lower temperatures, and dielectric peaks gradually become broad and frequency-dependent, which may be due to inconsistent chemical composition from core to shell.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst11060623