The formation of Y5V-type fine-grained ceramics based on spherical submicron BaZr0.1Ti0.9O3@Al2O3 particles

To improve multilayer ceramic capacitors (MLCCs), thinner dielectric layers are necessary. To achieve this goal, both grain size and uniformity of the MLCC particles must be controlled effectively. In this study, the core-shell structure of submicron-sized multi-function ceramic capacitors powder was synthesized using a novel precipitation route, which controls both dispersion and particle size of BaZr0.1Ti0.9O3 and BaZr0.1Ti0.9O3@Al2O3 particles. In this paper, we investigate the effect of Al2O3 coating on the microstructure and the dielectric properties of BaZr0.1Ti0.9O3. We found that both average grain size and maximum dielectric constant (εmax) of the ceramics decrease with increasing concentration of Al2O3. Our results demonstrate that fine-grained ceramic materials can meet the specifications of the Electronic Industries Alliance Y5V with a concentration of Al2O3-coated of 0.25 mol percent, a permittivity of 3393 at room temperature, and an average particle size of about 400 nm.