Synthesis of Barium Titanate Powders by Low-Temperature Aqueous Synthesis using a New Segmented Flow Tubular Reactor

摘要

Barium titanate powders have been synthesised using a Low Temperature Aqueous Synthesis (LTAS) method in both batch and Segmented Flow Tubular Reactors. For similar stoichiometries the SFTR powder shows a much lower degree of aggregation with 80% particles <100nm for the SFTR and only 57% <100nm for the batch case. Specific surface areas for the SFTR powder are also higher at around 50m~2/g compared to 38m~2/g for the batch powders indicative of primary particle sizes of 24 nm (SFTR) and 31 nm (batch). After freeze drying, re-dispersion and slip casting the SFTR powder gives improved sintered densities (95.5 from 93.25 %) the sintered microstructures are very similar.