Dielectric Properties of Epoxy Mixed with Microscale and Nanoscale (Ba0.8Sr0.2) (Ti0.9Zr0.1)O3 Ceramic Powders
(Ba0.8Sr0.2)(Ti0.9Zr0.1)O3 ceramic (BSTZ) was ground into two powders with different particle sizes, averaging 3 μm and 70 nm (3 μm-BSTZ and 70 nm-BSTZ). Different amounts of 3 μm-BSTZ and 70 nm-BSTZ were mixed with epoxy to form epoxy/BSTZ composites. Scanning electron microscopy showed that both powders were uniformly dispersed in the epoxy. The dielectric constants and loss tangents of the epoxy/BSTZ composites were measured using the plate method. When the same amount of BSTZ powder was used, the dielectric constants of the epoxy/3 μm-BSTZ and epoxy/70 nm-BSTZ composites were higher than those reported for epoxy/BaTiO3 composites; in addition, the dielectric constant of the epoxy/70 nm-BSTZ composite was higher than that of the epoxy/3 μm-BSTZ composite. The logarithmic mixing rule was also used to predict the dielectric constants of these epoxy/BSTZ composites and to find the effective dielectric constant of 70 nm-BSTZ.
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Document Type: Research Article
Publication date: November 1, 2013
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