Premium
Microstructure and Piezoelectric Properties of (K 0.5 Na 0.5 )NbO 3 –BaTiO 3 Lead‐Free Piezoelectric Ceramics Modified by B 2 O 3 –CuO
Author(s) -
Yan Kang,
Matsumoto Kohei,
Karaki Tomoaki,
Adachi Masatoshi
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.03932.x
Subject(s) - sintering , materials science , microstructure , piezoelectricity , natural bond orbital , grain size , ceramic , grain growth , mineralogy , composite material , analytical chemistry (journal) , chemistry , computational chemistry , chromatography , density functional theory
A combined sintering aid mixture of B 2 O 3 and CuO for lead‐free piezoelectric ceramics having the composition 0.95K 0.5 Na 0.5 NbO 3 –0.05BaTiO 3 (KNN‐BT) is introduced. The effects of the sintering aid mixture of 0.6B 2 O 3 –0.4CuO on the sintering behavior, microstructure, and electrical properties of KNN‐BT are investigated. Adding 2 wt% of the sintering aid mixture can effectively broaden the narrow sintering temperature range having a size of 20°C to above 50°C and increase the grain size of samples as well as maintain the high density of samples sintered at a low temperature. The increase in grain size contributes to an improvement in electrical properties. High piezoelectric properties of d 33 =205 pC/N, k p =38.0%, Q m =119, ɛ 33 T /ɛ 0 =1254, and tan δ=0.0264 are obtained for a KNN‐BT‐2wt% (B 2 O 3 –CuO) sample sintered at 1120°C.