期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 85, 期 1, 页码 201-206出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2004.01.003
关键词
dielectric properties; ceramics; polymer; composite materials
Three ceramic/epoxy composites were under investigation. The ceramic fillers include self-synthesized BaTiO3 and commercial BaTiO3 and Pb(Mg1/3Nb2/3)O-3. Effects of the filler ratio and testing temperature and frequency on the dielectric properties of these three composites were discussed. The self-synthesized BaTiO3/epoxy composite had the best dielectric property. Its 40%-filler composite had a dielectric constant of 44, which was hi-her than those of 27 and 24 for the commercial BaTiO3 and Pb(Mg1/3Nb2/3)O-3 composites, respectively. The large ceramic aggregates formed in epoxy are the reason for the self-synthesized BaTiO3/epoxy composite having a higher dielectric constant of 44. Composite dielectric constant was proportional to the Volume ratio of the ceramic filler and remained constant at different test temperatures and frequencies. For the BaTiO3/epoxy composites, the fabrication process of slurry-casting or screen-printing can have an effect on their porosity. The composites with a low porosity lead to a low dielectric loss tangent. (C) 2004 Elsevier B.V. All rights reserved.
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