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| Preparation and Properties of La2O3 Doped BST/Mg2TiO4 Microwave Composite Ceramics |
| WANG Cheng, HU Zuoqi, WU Shuangjie, WANG Qing, ZHAO Xu |
| Department of Electronics Science and Technology,Huazhong University of Science and Technology, Wuhan 430074 |
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Cite this article:
WANG Cheng HU Zuoqi WU Shuangjie WANG Qing ZHAO Xu. Preparation and Properties of La2O3 Doped BST/Mg2TiO4 Microwave Composite Ceramics. Chin J Mater Res, 2011, 25(1): 109-112.
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Abstract La2O3 doped Ba0.55Sr0.45TiO3/Mg2TiO4 microwave composite ceramics were prepared by traditional solid-state reaction, and the influence of La2O3 doping on microstructure, dielectric properties and tuning was investigated. The results show that La3+ enters BST lattices when the mass fraction of La2O3 reach 1.2%, and La3+ doped sample can prevent the change of the chemical valence of Ti in BST/Mg2TiO4 composite system from +4 to +3. Mg2TiO4 and La2O3 doping can reduce the dielectric constant and microwave loss separately. The 1.2% La2O3 doped sample has the best properties: dielectric constant 52; tanδ 0.0011 (10 GHz), and the tunability 13.4% (3 kV/mm).
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Received: 30 June 2010
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