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Ferroelectric and Piezoelectric Properties of Na 1− x Ba x Nb 1− x Ti x O 3 Ceramics
Author(s) -
Zeng J. T.,
Kwok K. W.,
Chan H. L. W.
Publication year - 2006
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.1551-2916.2006.01172.x
Subject(s) - ferroelectricity , curie temperature , materials science , dielectric , piezoelectricity , coercivity , ceramic , doping , analytical chemistry (journal) , mineralogy , phase transition , condensed matter physics , composite material , optoelectronics , chemistry , physics , ferromagnetism , chromatography
Piezoelectric ceramics Na 1− x Ba x Nb 1− x Ti x O 3 with low BaTiO 3 concentrations x have been prepared by the solid‐state reaction method, and their ferroelectric and piezoelectric properties have been studied. The ceramics are classic ferroelectrics when x ≤0.10, and the ferroelectric–paraelectric phase transition becomes diffusive when x ≥0.15. A low doping level of BaTiO 3 changes the NaNbO 3 ceramics from antiferroelectric to ferroelectric. With the increase in BaTiO 3 doping level, the Curie temperature of ceramics decreases linearly and the remnant polarization and coercive field also decrease, while their dielectric constant increases. Na 0.9 Ba 0.1 Nb 0.9 Ti 0.1 O 3 ceramics show the largest piezoelectric constant d 33 (147 pC/N) and good sinterability, suggesting that it is a good candidate for lead‐free piezoelectric ceramics.