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Improvement of Microwave Loss Tangent and Tunability of Ba 0.55 Sr 0.45 TiO 3 /MgO Composites Using the Heterogeneous Precipitation Method
Author(s) -
Liang RuiHong,
Dong XianLin,
Chen Ying,
Cao Fei,
Wang YongLing
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2006.01202.x
Subject(s) - materials science , microwave , microstructure , dissipation factor , precipitation , dielectric , composite material , dielectric loss , doping , microwave applications , grain size , mineralogy , optoelectronics , chemistry , physics , quantum mechanics , meteorology
Ba 0.55 Sr 0.45 TiO 3 /MgO composites were successfully prepared by the heterogeneous precipitation method and their structural, surface morphological, tunable properties, and dielectric properties at microwave frequency were systemically investigated. Compared with the sample prepared by the traditional solid‐state method, the sample prepared by the heterogeneous precipitation method exhibits a smaller grain size, more uniform microstructure, higher tunability, and lower microwave loss, and these properties are very beneficial to the development of the microwave tunable devices application. Moreover, the effects of La 2 O 3 doping on the dielectric and tunable properties of BST/MgO composites are investigated. The result shows that the La 3+ ‐doped sample has higher tunability and lower microwave loss than the undoped one.