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http://dx.doi.org/10.4191/kcers.2012.49.3.266

Effects of Bi(Mg1/2Sn1/2)O3 Modification on the Dielectric and Piezoelectric Properties of Bi1/2(Na0.8K0.2)1/2TiO3 Ceramics  

Pham, Ky Nam (School of Materials Science and Engineering, University of Ulsan)
Dinh, Thi Hinh (School of Materials Science and Engineering, University of Ulsan)
Lee, Hyun-Young (School of Materials Science and Engineering, University of Ulsan)
Kong, Young-Min (School of Materials Science and Engineering, University of Ulsan)
Lee, Jae-Shin (School of Materials Science and Engineering, University of Ulsan)
Publication Information
Journal of the Korean Ceramic Society / v.49, no.3, 2012 , pp. 266-271 More about this Journal
Abstract
The effect of $Bi(Mg_{1/2}Sn_{1/2})O_3$ (BMS) modification on the crystal structure, ferroelectric and piezoelectric properties of $Bi_{1/2}(Na_{0.8}K_{0.2})_{1/2}TiO_3$ (BNKT) ceramics has been investigated. The BMS-substitution induced a transition from a ferroelectric (FE) tetragonal to a nonpolar pseudocubic phase, leading to degradations in the remnant polarization, coercive field, and piezoelectric coefficient $d_{33}$. However, the electric-field-induced strain was significantly enhanced by the BMS substitution-induced phase transition and reached a highest value of $S_{max}/E_{max}$ = 633 pm/V under an applied electric field of 6 kV/mm when the BMS content reached 6 mol%. The abnormal enhancement in strain was attributed to the field-induced transition of the pseudocubic symmetry to other asymmetrical structure, which was not clarified in this work.
Keywords
Pizoelectric materials; Strain; Perovskites; Ferroelectric materials;
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