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Effects of CuO on the Electrical Properties of CaTiO 3 ‐Modified [(Na 0.52 K 0.48 ) 0.955 Li 0.045 ](Nb 0.955 Sb 0.045 )O 3 Lead‐Free Piezoceramics
Author(s) -
Huang Xiaolei,
Xiao Dingquan,
Li Xuhai,
Wu Wenjuan,
Liang Wenfeng,
Xie Ruishi,
Zhu Jianguo
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.1551-2916.2010.03895.x
Subject(s) - poling , tetragonal crystal system , materials science , ceramic , ferroelectricity , piezoelectricity , polarization (electrochemistry) , doping , dielectric , ferroelectric ceramics , condensed matter physics , dipole , mineralogy , perovskite (structure) , analytical chemistry (journal) , crystal structure , crystallography , composite material , optoelectronics , chemistry , physics , organic chemistry , chromatography
CuO‐doped and undoped 0.99[(Na 0.52 K 0.48 ) 0.955 Li 0.045 ](Nb 0.955 Sb 0.045 )O 3 –0.01CaTiO 3 (KNNLSCT) lead‐free piezoelectric ceramics have been synthesized by the conventional ceramic processing, where the effects of CuO on the phase structure and electrical properties were studied. All ceramics possess a perovskite structure with tetragonal symmetry. Because of the dipolar complex migration, the P–E loops of undoped ceramics become slanted and constricted at a high temperature, while this phenomenon disappears after the addition of CuO. The d 33 value decreases with the increasing poling temperature for the undoped ceramics, while the d 33 value increases with the increasing poling temperature after the addition of CuO. These phenomena have been explained by a model based on the formation of the defect polarization induced by spontaneous polarization, indicating that the spontaneous defect polarization has an important influence on the ferroelectric behavior of the KNNLSCT ceramics.