Effects of excess PbO on the preparation process of modified lead–calcium titanate ceramics

摘要

The effects of excess PbO on the preparation process of modified lead–calcium titanate ceramics were studied. The sintering period were divided into two stages: the initial sintering stage and the grain growth stage, at which the temperatures were chosen to be 980 and 1000 °C, respectively. In this study, an excess amount of PbO was added before the calcining stage and the initial sintering stage. The changes in the ceramic performance due to the excess amount of PbO were investigated. The figures of merit were the electromechanical coupling coefficients and mechanical quality factors. We observed that 1 mol% excess of PbO added at the calcining stage and 2.5 mol% excess of PbO added at the sintering stage would lead to a better performance and a smaller weight loss. By using the XRD and SEM results, the effects caused by the excess of PbO in the material processing were discussed.