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Temperature Stability of Electrical Properties of (K 0.5 Na 0.5 ) 1− x Li x Nb 0.95 Sb 0.05 O 3 Lead‐Free Ceramics
Author(s) -
Wu Lang,
Xiao Dingquan,
Li Xiang,
Zhu Jianguo,
Yu Ping,
Sun Yong,
Wang Yuanyu
Publication year - 2010
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2009.02380.x
Subject(s) - materials science , tetragonal crystal system , orthorhombic crystal system , ceramic , piezoelectricity , dielectric , ferroelectricity , phase (matter) , mixed oxide , analytical chemistry (journal) , oxide , crystal structure , composite material , crystallography , metallurgy , optoelectronics , chemistry , organic chemistry , chromatography
(K 0.5 Na 0.5 ) 1− x Li x Nb 0.95 Sb 0.05 O 3 (KNLNS‐ x, x =0–10 mol%) lead‐free piezoelectric ceramics were prepared by the conventional mixed‐oxide method. The temperature stability of the dielectric, piezoelectric, and ferroelectric properties of the two typical compositions (KNLNS‐2 with orthorhombic phase, and KNLNS‐7 with mixed phases) was investigated systematically. The relationship between the orthorhombic–tetragonal polymorphic phase transition (PPT) of the ceramics and the temperature stability of their electrical properties was also discussed. The electromechanical coupling factors ( k p and k 31 ) of the ceramics show the maximum values near the PPT, where the temperature stability of the resonance frequency is relatively poor. After the occurrence of the PPT, the remnant polarization ( P r ) of the ceramics shows a marked decrease, and a maximum peak in the coercive field ( E c ) is observed. Related mechanisms for the temperature stability of electrical properties were also discussed.