Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7214621 | Composites Science and Technology | 2018 | 9 Pages |
Abstract
Plate-like (Ba0.6Sr0.4)TiO3 (P-BST) particles were synthesized via topochemical microcrystal conversion using a two-step molten salt method. In addition, P-BST/poly(vinylidene fluoride) (PVDF) textured composites were fabricated using a tape casting and hot pressing method. The influence of the P-BST particle size on the microstructure, dielectric tunability, and energy storage properties of the P-BST/PVDF textured composites was investigated. The results revealed that P-BST/PVDF textured composites can be obtained with preferred orientation of plate-like particles, which exhibit uniform directionality in the PVDF matrix. The dielectric properties of these composites increased with increasing P-BST particle size. A new criterion EP80 was proposed for evaluating the dielectric tunability of composites. The optimal properties of the P-BST/PVDF textured composite (minimum threshold electric field: 14â¯kV/mm, minimum EP80: 29â¯kV/mm, and maximum energy storage density: 6.36â¯J/cm3) were realized at a P-BST particle size of 11.47â¯Î¼m. A dielectric tunability model for inorganic/organic composites with respect to the shape factor (n) of the inorganic fillers was proposed and used to simulate the dielectric tunability of the textured composites. For the P-BST/PVDF composite, n of 4-5 in the model corresponded to P-BST particle sizes of 5.19â¯Î¼m-11.47â¯Î¼m.
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Authors
Li Wang, Feng Gao, Jie Xu, Kena Zhang, Jie Kong, Mike Reece, Haixue Yan,