Preparation of Submicron CaCu3Ti4O12 Dispersions and Filled Epoxy Compositions Based on Them

Resumo

We have developed a technique for the preparation of a dielectric ceramic CaCu₃Ti₄O₁₂ filler and submicron dispersions of the filler in epoxy. The crystal structure of CaCu₃Ti₄O₁₂ has been refined using high-resolution neutron diffraction data with anisotropic atomic displacement parameters. We have studied the particle size distribution and rheological properties of CaCu₃Ti₄O₁₂ dispersions and, using rheological data, identified the surfactants that ensure Newtonian rheology of dispersions, convenient for filling porous templates. Surfactants have been shown to have a significant effect on dielectric characteristics of filled epoxy compositions.