Electrical Conduction Characteristics of the Epoxy/Nanoscale (Ba_(0.8)Sr_(0.2))(Ti_(0.9)Zr_(0.1))O_3 Ceramic Powder Composites

摘要

In this study, the (Ba_(0.8)Sr_(0.2))(Ti_(0.9)Zr_(0.1))O_3(abbreviate as BSTZ) ceramic was ground into nanoscale powders using the nano-ground technique, and it's average particle size was 70 nm (nano-BSTZ). Different nano-BSTZ contents were mixed with O-Cresol Novolac (OCN) epoxy resin to form the epoxyano-BSTZ composites. As observed from the images of the scanning electron microscopy, the nano-BSTZ were uniformly dispersed in OCN epoxy. The dielectric constants (ε_r) and loss tangents (tanδ) of the epoxyano-BSTZ composites were measured using the sandwich structure. The results measured at 1 MHz showed that the epoxyano-BSTZ composites had high dielectric constants and low loss tangents (<0.05). The equivalent electrical conduction models of the epoxyano-BSTZ composites were established by using the Lichtenecker, Maxwell-Wagner, and Yamada mixing rules. The change ratios of the dielectric peak (K_(max)) in the dielectric constant-temperature curves of the epoxyano-BSTZ composites were small than those of the BSTZ ceramic.