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High and Frequency‐Insensitive Converse Piezoelectric Coefficient Obtained in AgSbO 3 ‐Modified ( Li , K , Na )( Nb , Ta ) O 3 Lead‐Free Piezoceramics
Author(s) -
Zhou JiaJun,
Wang Ke,
Li Fu,
Li JingFeng,
Zhang XiaoWen,
Wang QingMing
Publication year - 2013
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.12061
Subject(s) - curie temperature , materials science , orthorhombic crystal system , tetragonal crystal system , analytical chemistry (journal) , piezoelectricity , ceramic , phase transition , piezoelectric coefficient , doping , grain size , mineralogy , microstructure , composite material , crystallography , crystal structure , chemistry , condensed matter physics , ferromagnetism , physics , optoelectronics , chromatography
AgSbO 3 was doped into KNN ‐based lead‐free piezoceramics with an optimized composition of Li 0.02 ( Na 0.53 K 0.48 ) 0.98 Nb 0.8 Ta 0.2 O 3 (abbreviated as LKNNT ) to further enhance its piezoelectric property. The doping of AgSbO 3 was found to be effective in reducing the grain sizes, resulting in more uniform microstructure in AgSbO 3 ‐doped LKNNT ceramics. AgSbO 3 lowers tetragonal‐orthorhombic phase transition point ( T T‐O ), but with a more gentle rate as compared with other dopants. A large converse piezoelectric coefficient d 33 * up to 598 pm/V under a relatively low electric field of 1 kV/mm was obtained in the LKNNT ‐5 mol% AgSbO 3 composition, whose tetragonal‐orthorhombic phase transition point ( T T‐O ) was controlled near room temperature, but its Curie temperature was kept at 235°C. The d 33 * obtained in the present material is a very high value for nontextured KNN ‐based ceramics, which is attributed to the polymorphism phase transition effect and “soft” behavior caused by the addition of AgSbO 3 .