Synthesis of Tetragonal Batio3 Powder with Size and Dispersity Optimization Via Synergy Mechanisms of Combined Dispersants

Abstract

Tetragonal BaTiO3 powder with appropriate size and dispersity is essential for the dielectric layers in multilayer ceramic capacitor technology. In this work, high tetragonality BaTiO3 powder with controllable dispersion, and particle size was synthesized using combined dispersants and a two-step hydrothermal method. Owing to the synergistic effect of chemical bond force and electrostatic adsorption force between CTAB and PVP composite dispersants at a high temperature, the ultrafine BaTiO3 powder with a high c/a of 1.0090, small size of 236±15 nm and low polydispersity index of 0.336 was achieved. This idea shows great significance for the synthesis of BaTiO3 powder with high tetragonal, high dispersion, and small particle sizes.

Keywords: Barium titanate, High tetragonality, Size and dispersity control, Combined dispersants