Microstructures and Dielectric Properties of Ba_1-xSr_xTiO₃ Ceramics Doped with B₂O₃-Li₂O Glasses for LTCC Technology Applications

Xiujian Chou1), Zhenyu Zhao1), Miaoxuan Du1), Jun Liu1) and Jiwei Zhai2) 1) Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Education, National Key Labora- tory of Science and Technology on Electronic Test and Measurement (North University of China), Taiyuan 030051, China 2) Functional Materials Research Laboratory, Tongji University, Shanghai 200092, China

摘 要：Ba1-xSrxTiO3 ceramics, doped with B2O3-Li2O glasses have been fabricated via a traditional ceramic process at a low sintering temperature of 900 ℃ using liquid-phase sintering aids. The microstructures and di- electric properties of B2O3-Li2O glasses doped Ba1-xSrxTiO3 ceramics have been investigated systemat- ically. The temperature dependence dielectric constant and loss reveals that B2O3-Li2O glasses doped Ba1-xSrxTiO3 ceramics have di?usion phase transformation characteristics. For 5 wt% B2O3-Li2O glasses doped Ba0.55Sr0.45TiO3 composites, the tunability is 15.4% under a dc-applied electric field of 30 kV/cm at 10 kHz; the dielectric loss can be controlled about 0.0025; and the Q value is 286. These composite ceramics sintered at low temperature with suitable dielectric constant, low dielectric loss, relatively high tunability and high Q value are promising candidates for multilayer low-temperature co-fired ceramics （LTCC） and potential microwave tunable devices applications.

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