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Preparation and Electric Properties of Bi 0.5 Na 0.5 TiO 3 – Bi ( Al 0.5 Ga 0.5 ) O 3 Lead‐Free Piezoceramics
Author(s) -
Wang Qi,
Chen Jun,
Fan Longlong,
Song Huidong,
Gao Wei,
Rong Yangchun,
Liu Laijun,
Fang Liang,
Xing Xianran
Publication year - 2013
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.12588
Subject(s) - ferroelectricity , curie temperature , materials science , piezoelectricity , ceramic , antiferroelectricity , analytical chemistry (journal) , fabrication , mineralogy , phase transition , phase (matter) , transition temperature , dielectric , condensed matter physics , composite material , chemistry , optoelectronics , physics , medicine , alternative medicine , organic chemistry , chromatography , pathology , ferromagnetism , superconductivity
A new lead‐free BNT ‐based piezoelectric ceramics of (1 − x ) Bi 0.5 Na 0.5 TiO 3 – x Bi ( Al 0.5 Ga 0.5 ) O 3 ( x = 0, 0.02, 0.03, 0.04, and 0.05) were synthesized using a conventional ceramic fabrication method. Their structures and electrical properties were investigated. All the samples show a typical ferroelectric P ( E ) loops and S ( E ) curves at room temperature. The optimal properties are obtained at the composition of the x = 0.03. The substitution of Bi ( Al 0.5 Ga 0.5 ) O 3 enhances piezoelectric constant and increases Curie temperature from 58 pC/N and 310°C of pure BNT to 93 pC/N and 325°C of the x = 0.03. The temperature‐dependent P ( E ) loops and S ( E ) curves of 0.97BNT–0.03BAG indicate that phase transition from ferroelectric to antiferroelectric takes place over a very wide temperature region from 80°C to 180°C. The results show that the introduction of BAG improves the electrical properties of BNT .