Dieletric and relaxation behaviors of (PbMg1/3Nb2/3O3)0.67(PbTiO3)0.33 single crystal |
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Authors: | Chi-Shun Tu V H Schmidt H Luo F C Chao |
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Affiliation: |
a Department of Physics, Fu-Jen University, Taipei, Taiwan
b Department of Physics, Montana State University, Bozeman, MT
c Shanghai Institute of Ceramics Chinese Academy of Sciences, Shanghai, PR. China |
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Abstract: | Dielectric permittivity along the 111] direction has been measured as a function of temperature for a relaxor ferroelectric single crystal (PbMg1/3Nb2/3O3)0.67(PbTiO3)0.33 (PMN-33%PT). A sharp ferroelectric phase transition was observed near 425 K and 429 K for cooling and heating processes, respectively. As temperature decreases, a diffuse phase transition (which begins near 330 K upon cooling) was detected. In addition, the nature of the thermal hysteresis for the dielectric permittivity confirms that these transitions (near 330 and 425 K upon cooling) are diffuse first-order and first-order, respectively. The frequency-dependent dielectric data ε'111 (?, T) prove the existence of an electric dipolar relaxation process between 350 and 400 K. The activation energy, the Vogel-Fulcher temperature and attempt frequency corresponding to this relaxation process are also calculated. |
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Keywords: | Dielectric permittivity frequency dispersion phase transition |
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