Different piezoelectric grain size effects in BaTiO3 ceramics

摘要

Four groups of barium titanate (BaTiO3) ceramics with high piezoelectric coefficient have been successfully fabricated from different raw materials. Their average grain size (g) dependences of the piezoelectric coefficient d(33) were systematically studied. It was found that for two groups of BaTiO3 ceramics, d(33) firstly increases and then decreases with the increase of g, with a maximum d(33) of 449 pC/N and 501 pC/N respectively at approximately 1 gm grain size, while for the other two groups of BaTiO3 ceramics, d(33) keeps increasing with the increase of g. The highest d(33) of 401 pC/N and 424 pC/N were obtained when g is larger than 50 mu m. The experimental results indicated that piezoelectric grain size effect in BaTiO3 ceramics may be not absolute. Possible mechanisms arising from differences in domain configuration were discussed. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.