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Dielectric tunable properties of BaTi_4O_9-doped Ba_(0.6)Sr_(0.4)TiO_3 microwave composite ceramics 被引量:3

Dielectric tunable properties of BaTi_4O_9-doped Ba_(0.6)Sr_(0.4)TiO_3 microwave composite ceramics
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摘要 BaTi4O9-doped Ba0.6Sr0.4TiO3 (BST) composite ceramics were prepared by the conventional solid-state reaction and their structure, dielectric nonlinear characteristics and microwave dielectric properties were investigated. The secondary phase of the orthorhombic structure Ba4Ti13O30 is formed among BST composite ceramics with the increase of BaTi4O9. At the same time, a duplex or bimodal grains size distribution shows fine grains in a coarse grain matrix. The degree of frequency dispersion of dielectric permittivity below Tm is increased initially and then decreased with respect to BaTi4O9. As the BaTi4O9 content increases, the tunability of composite ceramics decreases, while the Q value increases. Inter-estingly, 70 wt% BaTi4O9-doped BST has a tunability ~4.0% (under 30 kV/cm biasing) versus a permit- tivity ~68 and quality factor ~134.1 (at ~3.2 GHz).
出处 《Science China(Technological Sciences)》 SCIE EI CAS 2009年第1期116-122,共7页 中国科学(技术科学英文版)
基金 Supported by the Ministry of Science and Technology of China through 973-project (Grant No. 2009CB623302) the Cultivation Fund of the Key Scientific and Techni-cal Innovation Project, Ministry of Education of China (Grant No.707024) Shanghai Committee of Science and Technology (Grant No. 07DZ22302) Shanghai Foundation Project under 06JC14070
关键词 TUNABILITY MICROWAVE DIELECTRIC properties composite CERAMICS tunability, microwave dielectric properties, composite ceramics
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