Journal of the Korean Physical Society

Korean Physical Society (한국물리학회)
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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)
  • Published : 2012.01.31
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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

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