期刊
MATERIALS RESEARCH BULLETIN
卷 44, 期 3, 页码 566-570出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2008.07.016
关键词
Ceramics; X-ray diffraction; Dielectric properties; Microstructure
资金
- Cultivation Fund of the Key Scientific and Technical Innovation Project, Ministry of Education of China [707024]
- Ministry of Sciences and Technology of China [2009CB623302]
- Program for New Century Excellent Talents in University [NCET-04-0378]
- Shanghai Committee of Science and Technology [07DZ22302]
In this study, we tried to lower the sintering temperature of Ba0.6Sr0.4TiO3 (BST) ceramics by several kinds of adding methods of Bi2O3, CuO and CuBi2O4 additives. The effects of different adding methods on the microstructures and the dielectric properties of BST ceramics have been studied. In the all additive systems, the single addition of CuBi2O4 was the most effective way for lowering the sintering temperature of BST. When CuBi2O4 of 0.6 mol% was mixed with starting BST powders and sintered at 1100 degrees C. the derived ceramics demonstrated dense microstructure with a low dielectric constant (epsilon = 4240), low dielectric loss (tan delta = 0.0058), high tunability (Tun = 38.3%) and high Q value (Q = 251). It was noteworthy that the sintering temperature was significantly lowered by 350 degrees C compared with no-additive system, and the derived ceramics maintained the excellent microwave dielectric properties corresponding to pure BST. (C) 2008 Published by Elsevier Ltd.
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