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Fabrication and Electrical Properties of (Bi1/2Na1/2)TiO3-BiAlO3 Ferroelectric Ceramics

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Abstract:

(1-x)(Bi1/2Na1/2)TiO3-xBiAlO3 [BNTA100x (0 ≤ x ≤ 0.14)] ceramics were prepared by a conventional ceramic fabrication process. Single-phase perovskite structures were formed when x ≤ 0.08 for BNTA100x. The depolarization temperature, Td, at which piezoelectricity disappears, decreased with increasing x. The piezoelectric constant, d33, increased with increasing x because of the increase in free permittivity accompanied with decreasing Td. d33 and the electromechanical coupling factor, k33, of BNTA6 were 93 pC/N and 0.41, respectively. Normalized strain d33* (= Smax/Emax) at 60 kV/cm at the maximum field-induced strain was 122.2 pm/V for BNTA8. The value of d33* was higher than the calculated value of d33.

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Periodical:

Key Engineering Materials (Volume 388)

Pages:

229-232

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.388.229

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Online since:

September 2008

Authors:

Yoshinori Watanabe, Yuji Hiruma, Hajime Nagata, Tadashi Takenaka

Keywords:

Bismuth Aluminate, Bismuth Sodium Titanate (BNT), Phase Transition Temperature, Piezoelectric Constant

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© 2009 Trans Tech Publications Ltd. All Rights Reserved

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