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J. Korean Ceram. Soc. > Volume 45(5); 2008 > Article
Journal of the Korean Ceramic Society 2008;45(5): 263.
doi: https://doi.org/10.4191/kcers.2008.45.5.263
(Bi1⁄2Na1⁄2)1-xCaxTiO3 세라믹스의 압전 특성 및 상전이 거동
이용현, 조정호1, 김병익1, 최덕균
한양대학교 신소재공학과
Piezoelectric Properties and Phase Transition behaviors of (Bi1/2Na1/2)1- xCaxTiO3Ceramics
Yong-Hyun Lee, Jeong-Ho Cho1, Byung-Ik Kim1, Duck-Kyun Choi
Department Ceramic Engineering, Hanyang University
1Department of Ceramic Building Materials Research, Korea Institute of Ceramic Engineering and Technology
$(Bi_{1/2}Na_{1/2})TiO_3$-based ceramics have been intensively studied as lead-free piezoelectric ceramics. In this study, the piezoelectric properties and phase transition behaviors of BNT based solid solution $(Bi_{0.5}Na_{0.5})_{1-x}Ca_xTiO_3$ ($X=0.01{sim}0.25$) were investigated. The morphotropic phase boundary(MPB) zone which BNT is transformed from rhombohedral to cubic structure was appeared by adding $CaTiO_3$ with 0.12 mol by the measurement of permittivity and X-ray diffraction. The behavior which ferroelectric BNT with adding $CaTiO_3$ was changed to antiferroelectric and paraelectric state was confirmed by the measurement ofhysterisis loop and depolarization temperature as a function of temperature. As $CaTiO_3$ concentration was increased, the phase transition temperature was decreased. The piezoelectric properties were highest at 0.01 mol of $CaTiO_3$ concentration. The electromechanical coupling factor($K_t$) and mechanical quality factor($Q_m$) were 42% and 254, respectively.
Key words: Lead Free, Piezoelectric$(Bi_{1/2}Na_{1/2})TiO_3$, Phase transition, Ferroelectric
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