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The Relationship Between Phase Structure and Electrical Properties in (1 − x )( Bi 0.5 Na 0.5 TiO 3 – Ba 0.5 K 0.5 TiO 3 – BaTiO 3 )‐ x K 0.5 Na 0.5 NbO 3 Quaternary Lead‐Free Piezoelectric Ceramics
Author(s) -
Dai YeJing,
He SiSi,
Lao Xun,
Zhang ShiZheng
Publication year - 2014
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.12760
Subject(s) - tetragonal crystal system , phase (matter) , materials science , dielectric , trigonal crystal system , natural bond orbital , piezoelectricity , analytical chemistry (journal) , crystallography , mineralogy , crystal structure , chemistry , composite material , density functional theory , computational chemistry , optoelectronics , organic chemistry , chromatography
(1 − x )(0.85 Bi 0.5 Na 0.5 TiO 3 –0.11 Ba 0.5 K 0.5 TiO 3 –0.04 BaTiO 3 )‐ x K 0.5 Na 0.5 NbO 3 lead‐free piezoelectric ceramics with x = 0.00, 0.02, 0.03, 0.04, 0.05, and 0.10 were prepared by a conventional solid state method. A coexistence of rhombohedral (R) and tetragonal (T) phases was found in the system, which tended to evolve into pseudocubic symmetry when x increases. The x = 0.04 sample exhibited improved electrical properties: the dielectric constant ε r = 1900 with the low loss tangents 0.06, the S max / E max of ~400 and ~460 pm/V under unipolar and bipolar electric field, respectively. Meanwhile, piezoelectric constant d 33 still maintained ~160 pC/N. These could be owed to the formation of polar nanoregions for relaxor phase.