Piezoelectric and ferroelectric properties of Bi-compensated ( Bi 1 / 2 Na 1 / 2 ) TiO 3 - ( Bi 1 / 2 K 1 / 2 ) TiO 3 lead-free piezoelectric ceramics

( Bi 1 / 2 Na 1 / 2 ) TiO 3 - ( Bi 1 / 2 K 1 / 2 ) TiO 3 (BNT-BKT) ceramics as a promising candidate for lead-free piezoelectric ceramics were studied with a special emphasis on the compositional dependence of piezoelectric and ferroelectric properties. One mole percent excess Bi was added to compen...

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Published in:Journal of applied physics 2008-04, Vol.103 (7), p.074109-074109-6
Main Authors: Zhang, Ya-Ru, Li, Jing-Feng, Zhang, Bo-Ping, Peng, Chun-E
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Summary:( Bi 1 / 2 Na 1 / 2 ) TiO 3 - ( Bi 1 / 2 K 1 / 2 ) TiO 3 (BNT-BKT) ceramics as a promising candidate for lead-free piezoelectric ceramics were studied with a special emphasis on the compositional dependence of piezoelectric and ferroelectric properties. One mole percent excess Bi was added to compensate for the volatilization of Bi 3 + ions during sintering, which was found to be effective in improving the piezoelectric properties of the resultant BNT-BKT ceramics. The piezoelectric, ferroelectric, and dielectric properties of the Bi-compensated BNT-BKT ceramics were investigated and discussed in relation to the morphotropic phase boundary that is close to the composition range of 20 - 24   mol % BKT. The maximum piezoelectric constant d 33 (207 pC/N) and electromechanical coupling factor k p (35%) were obtained at the compositions of 23% and 20%, respectively.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.2902805