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Further Enhancing Piezoelectric Properties by Adding MnO 2 in AgSbO 3 ‐Modified (Li,K,Na)(Nb,Ta)O 3 Lead‐Free Piezoceramics
Author(s) -
Liu Qing,
Zhu FangYuan,
Zhao Lei,
Wang Ke,
Li Longtu,
Li JingFeng
Publication year - 2016
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.14412
Subject(s) - piezoelectricity , materials science , piezoresponse force microscopy , microstructure , electromechanical coupling coefficient , piezoelectric coefficient , ferroelectricity , ceramic , phase (matter) , composite material , mineralogy , analytical chemistry (journal) , dielectric , optoelectronics , chemistry , organic chemistry , chromatography
This work investigated the effect of MnO 2 addition on the phase structure, microstructure, and electrical properties of AgSbO 3 ‐modified (Li,K,Na)(Nb,Ta)O 3 (abbreviated as LKNNT ‐ AS ) lead‐free piezoelectric ceramics with an optimized composition endowed with a state of two‐phase coexistence. A small amount (0.1 wt%) of MnO 2 can significantly further enhance the piezoelectric property of LKNNT ‐ AS ceramics, whose piezoelectric constant d 33 and converse piezoelectric coefficient d 33 * as well as planar electromechanical coupling factor k p reach 363 pC /N, 543 pm/V, and 0.49, respectively. The temperature stability of piezoelectricity in MnO 2 ‐modified LKNNT ‐ AS samples also improved, which is associated with the more uniform and better thermally stable ferroelectric domains that were revealed by piezoresponse force microscopy.