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http://dx.doi.org/10.4313/TEEM.2011.12.2.64

Effect of Ta-Substitution on the Ferroelectric and Piezoelectric Properties of Bi0.5/(Na0.82K0.18)0.5TiO3 Ceramics  

Do, Nam-Binh (School of Materials Science and Engineering, University of Ulsan)
Lee, Han-Bok (School of Materials Science and Engineering, University of Ulsan)
Yoon, Chang-Ho (School of Materials Science and Engineering, University of Ulsan)
Kang, Jin-Kyu (School of Materials Science and Engineering, University of Ulsan)
Lee, Jae-Shin (School of Materials Science and Engineering, University of Ulsan)
Kim, Ill-Won (Department of Physics, University of Ulsan)
Publication Information
Transactions on Electrical and Electronic Materials / v.12, no.2, 2011 , pp. 64-67 More about this Journal
Abstract
The effect of Ta substitution on the crystal structure, ferroelectric, and piezoelectric properties of $Bi_{0.5}(Na_{0.82}K_{0.18})_{0.5}Ti_{1-x}Ta_xO_3$ ceramics has been investigated. The Ta doping resulted in a transition from coexistence of ferroelectric tetragonal and rhombohedral phases to an electrostrictive pseudocubic phase, leading to degradations of the remnant polarization, coercive field, and piezoelectric coefficient $d_{33}$. However, the electricfield-induced strain was significantly enhanced by the Ta substitution-induced phase transition and reached a highest value of $S_{max}/E_{max}$ = 566 pm/V under an applied electric field 6 kV/mm when 2% Ta was substituted on Ti sites. The abnormal enhancement in strain was attributed to the pseudocubic phase with high electrostrictive constants.
Keywords
Lead-free piezoelectric ceramics; Bismuth sodium potassium titanate; Tantalum-doping; Electric-fieldinduced strain;
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