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The Korean Ceramic Society (한국세라믹학회)
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Phase Transition Behaviors of Lead-Free Piezoelectric (Na1/2Bi1/2TiO3)(1-x)-(BaTiO3)x

납이 포함되지 않은 압전 특성의 (Na1/2Bi1/2TiO3)(1-x)-(BaTiO3)x 상전이 거동 연구

  • Lee, Byoungwan (School of Chemical Engineering, Sungkyunkwan University) ;
  • Luo, Haosu (Shanghai Institute of Ceramics, Chinese Academy of Sciences) ;
  • Kim, Jung Kyu (School of Chemical Engineering, Sungkyunkwan University)
  • 이병완 (성균관대학교 화학공학과) ;
  • ;
  • 김정규 (성균관대학교 화학공학과)
  • Received : 2020.02.19
  • Accepted : 2020.03.17
  • Published : 2020.03.31
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Abstract

In this study, the phase transition behaviors of lead-free (Na1/2Bi1/2TiO3)(1-x)-(BaTiO3)x (NBT-BT) are investigated by using Brillouin spectroscopy. The elastic properties, sound velocity and absorption coefficient of NBT-BT are characterized as a function of temperature along different crystallographic axes. The temperature dependences of the elastic constants of NBT-BT near the morphotropic phase boundary are determined for the first time. The unpoled NBT-BT single crystals exhibits the typical relaxor behaviors, presenting broad acoustic and dielectric anomalies. The application of electric field induced discontinuous changes in the elastic properties at ~110℃, which indicates field-induced phase transition occurred. The electric field also changes the dielectric constant from more relaxor-like to ferroelectric-like dielectric behavior.

Keywords

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