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http://dx.doi.org/10.3938/jkps.60.207

Dielectric, Ferroelectric, and Piezoelectric Properties of Nb-substituted $Bi_{1/2}(Na_{0.82}K_{0.18})_{1/2}TiO_3$ Lead-free Ceramics  

Pham, Ky-Nam (School of Materials Science and Engineering, University of Ulsan)
Lee, Han Bok (School of Materials Science and Engineering, University of Ulsan)
Han, Hyoung-Su (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)
Ullah, Aman (Department of Physics, University of Ulsan)
Ahn, Chang-Won (Department of Physics, University of Ulsan)
Kim, Ill Won (Department of Physics, University of Ulsan)
Publication Information
Journal of the Korean Physical Society / v.60, no.2, 2012 , pp. 207-211 More about this Journal
Abstract
The effects of niobium substitution on the crystal structure and on the ferroelectric and piezoelectric properties of $Bi_{1/2}(Na_{0.82}K_{0.18})_{1/2}TiO_3$ (BNKT) ceramics have been investigated. X-ray diffraction analyses revealed that Nb-substitution induced a phase transition from the coexistence of rhombohedral-tetragonal symmetry to pseudocubic symmetry. Accordingly, the electric-fieldinduced polarization and strain hysteresis loops indicated that Nb substitution significantly disrupted the ferroelectric order of BNKT ceramics, leading to degradations in the remnant polarization, coercive field, and piezoelectric coefficient $d_{33}$. However, the destabilization of the ferroelectric order was accompanied by a significant enhancement in the electric-field-induced strain (EFIS), which peaked at x = 0.03 with a value of 0.47%. The abnormal enhancement in the EFIS could be attributed to a phase transition from a non-polar to a polar phase under an applied electric field.
Keywords
Lead-free piezoelectric; Electric-field-induced strain; Bismuth perovskite;
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