Wang Zhuo and Li Yong-Xiang 2009 Chinese Phys. Lett. 26 117701 doi:10.1088/0256-307X/26/11/117701
Wang Zhuo1,2 and Li Yong-Xiang1
Show affiliationsDielectric tunable composite ceramics Ba0.6Sr0.4 TiO3-Mg2TiO4 (BST-MT) are prepared with a heterogeneous nucleation sol-gel approach. The Mg2TiO4 powders are synthesized by the conventional solid-state reaction method. The micro-sized MT powders with dispersant Ciba-4010 are introduced into Ba-Sr-Ti sol to obtain uniform and homogeneous mixture compounds with nano-sized BST particles synthesized via heterogeneous nucleation (HN) in the sol-gel process. Thus, the microstructural and dielectric properties can be tailored. The dielectric constants of BST-MT composite ceramics can be adjusted in a large range from 294 to 1790, and the dielectric tunability can be adjusted from 29.4% to 37.0% with different MT contents from 60 wt% to 20 wt%. Compared to the samples prepared by the conventional solid-state (SS) process, the BST-MT composite ceramics by the heterogeneous nucleation sol-gel process exhibit a more uniform microstructure, and improve dielectric properties.
81.05.Mh Cermets, ceramic and refractory composites
77.84.Dy Niobates, titanates, tantalates, PZT ceramics, etc.
Issue 11 (November 2009)
Received 10 April 2009
Wang Zhuo and Li Yong-Xiang 2009 Chinese Phys. Lett. 26 117701
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