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Enhanced Piezoelectric Properties and Thermal Stability in the (K 0.5 Na 0.5 )NbO 3 :ZnO Lead‐Free Piezoelectric Composites
Author(s) -
Pan Zhao,
Chen Jun,
Fan Longlong,
Zhang Ji,
Zhang Shantao,
Huang Yu,
Liu Laijun,
Fang Liang,
Xing Xianran
Publication year - 2015
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/jace.13831
Subject(s) - piezoelectricity , materials science , thermal stability , curie temperature , natural bond orbital , piezoelectric coefficient , composite material , composite number , mineralogy , condensed matter physics , chemical engineering , ferromagnetism , chemistry , density functional theory , physics , computational chemistry , engineering
The piezoelectric properties of (K 0.5 Na 0.5 )NbO 3 ( KNN ) are normally enhanced by chemical substitutions or doping to form solid solutions. In this study, we report that the piezoelectric properties of KNN and thermal stability of piezoelectric coefficient d 33 can be both enhanced by forming the composite of KNN :ZnO. The d 33 of KNN :0.2ZnO can be improved to 110 pC/N by introducing the ZnO nanoparticles, which is better than the pure KNN ( d 33 = 85 pC/N). The Curie temperature ( T C = 407°C) remains well comparable to the pure KNN ( T C = 408°C). Furthermore, the thermal stability of both remanent polarization ( P r ) and piezoelectric parameter ( d 33 ) is improved. The enhanced thermal stability could be related to the induced built‐in electric field or the enhanced sinterability by the addition of ZnO. The present results may help to optimize the piezoelectric properties of lead‐free materials by forming composite.