La2O3掺杂BST/Mg2TiO4微波复合陶瓷的制备和性能

材料研究学报, 2011, 25(1): 109-112.

La2O3掺杂BST/Mg2TiO4微波复合陶瓷的制备和性能

华中科技大学电子科学与技术系武汉 430074

Department of Electronics Science and Technology,Huazhong University of Science and Technology, Wuhan 430074

关键词：无机非金属材料 , La2O3 doped , solid-state reaction , BST composite ceramics , microwave loss

Preparation and Properties of La2O3 Doped BST/Mg2TiO4 Microwave Composite Ceramics

WANG Cheng HU Zuoqi WU Shuangjie WANG Qing ZHAO Xu

Keywords： inorganic non-metallic materials, La2O3 doped, solid-state reaction, BST composite inorganic non-metallic materials , La2O3掺杂 , 固相烧结法 , BST复合陶瓷 , 微波损耗

用固相烧结法制备掺杂La2O3的Ba0.55Sr0.45TiO3/Mg2TiO4微波复合陶瓷, 研究了掺杂对其微观结构、微波(f=10 GHz)介电性能和调谐率的影响。结果表明: 当掺杂La2O3量(质量分数)为1.2%时, La3+进入BST晶格, 且抑制了BST/Mg2TiO4中Ti从+4向+3价转化; La2O3的掺入比较明显地降低了介电常数和微波损耗, 当掺杂La2O3量为1.2%时介电常数为52, 损耗角为0.0011(f=10 GHz), 调谐率13.6%(3 kV/mm)。

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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