La_2O_3掺杂BST/Mg_2TiO_4微波复合陶瓷的制备和性能  

Preparation and Properties of La_2O_3 Doped BST/Mg_2TiO_4 Microwave Composite Ceramics

作　　者：王成[1] 胡作启[1] 伍双杰[1] 王庆[1] 赵旭[1] 

机构地区：[1]华中科技大学电子科学与技术系,武汉430074

出　　处：《材料研究学报》2011年第1期109-112,共4页Chinese Journal of Materials Research

摘　　要：用固相烧结法制备掺杂La_2O_3的Ba_(0.55)Sr_(0.45)TiO_3/Mg_2TiO_4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La_2O_3量(质量分数)为1.2%时,La^(3+)进入BST晶格,且抑制了BST/Mg_2TiO_4中Ti从+4向+3价转化;La_2O_3的掺入比较明显地降低了介电常数和微波损耗,当掺杂La_2O_3量为1.2%时介电常数为52,损耗角为0.0011(f=10 CHz),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 La^3＋ enters BST lattices when the mass fraction of La2O3 reach 1.2%, and La^3＋ 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）.

关 键 词：无机非金属材料 La2O3掺杂 固相烧结法 BST复合陶瓷 微波损耗 调谐率 

分 类 号：TB321[一般工业技术—材料科学与工程] TM28[电气工程—电工理论与新技术]