Journal
MATERIALS RESEARCH BULLETIN
Volume 67, Issue -, Pages 251-254Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2015.01.013
Keywords
Ceramics; Dielectric properties
Categories
Funding
- Natural Science Foundation of China [51332006]
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Microwave dielectric properties of CaCu3Ti4O12, Ba(Fe1/2Nb1/2)O-3 and Sr(Fe1/2Nb1/2)O-3 ceramics were evaluated at 3.4-9.5 GHz, focusing on the effects of sintering temperature and annealing atmosphere. Their dielectric constant showed slight frequency dependence, and was insensitive to the preparing conditions. Their dielectric loss decreased and Qf value increased greatly with frequency, indicating the domination of extrinsic polarization on microwave dielectric loss. Microwave dielectric loss increased significantly with sintering temperature for CaCu3Ti4O12, while the annealing atmosphere had more notable effect on the dielectric loss of Ba(Fe1/2Nb1/2)O-3 and Sr(Fe1/2Nb1/2)O-3, indicating the different extrinsic polarization mechanisms at microwave frequencies for the three ceramics. (C) 2015 Elsevier Ltd. All rights reserved.
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