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In this paper, a series of BaTiO3-SiO2 composites were fabricated by using a combined process of SiO2 wet chemical coating and conventional ceramic process, and the effects of SiO2 coating on microstructures, dielectric and ferroelectric properties were investigated. XRD diffraction patterns illustrated a typical perovskite structure of the SiO2 coated BaTiO3 particles, which confirmed an amorphous...
Traditional microwave absorbers are typically made of ferrite powders and/or ferromagnetic metal powders and rely on ferromagnetic relaxation in the powders [1]. These absorbers can show strong absorption over a relatively wide frequency range if the thickness is sufficiently large, and for a given absorption level the frequency bandwidth usually decreases with a reduction in the thickness. One can...
The development of high-k composites based on CaCu3Ti4O12 (CCTO) ceramic powder is reported. The CCTO ceramic powders were prepared by traditional sintering method and were milled with a relative uniform size. Based on solution casting method, the composite using P(VDF-TrFE) copolymer as matrix and CCTO powders as filler were prepared and its dielectric response were characterized. The dielectric...
Nano-sized Ba0.5Sr0.5TiO3 (BST) powders are used to develop 0??3 nanocomposite. In the experiment, P(VDF-CTFE) copolymer was used as polymer matrix. It is found that the wettability between the polymer and ceramic powders is poor. The process to improve homogeneity of the composite was investigated. The uniform nanocomposites were obtained by using multi-layer hot press after solution casting. The...
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