Phase Transformation and Dielectric Relaxation in <TEX>$Pb(Mg_{1/3}Nb_{2/3})O_3-PbTiO_3$</TEX> Relaxor Ferroelectrics

Park, Jae-Hwan; Park, Jae-Hwan

J. Korean Ceram. Soc. > Volume 38(10); 2001 > Article

Journal of the Korean Ceramic Society 2001;38(10): 953.

완화형 강유전체 $Pb(Mg_{1/3}Nb_{2/3})O_3-PbTiO_3$계에서의 상전이 및 Relaxation 거동

박재환

한국과학기술연구원 재료연구부

Phase Transformation and Dielectric Relaxation in $Pb(Mg_{1/3}Nb_{2/3})O_3-PbTiO_3$ Relaxor Ferroelectrics

Jae-Hwan Park

Division of Materials, KIST

ABSTRACT

To study various relaxation phenomena of $Pb(Mg_{1/3}Nb_{2/3})O_3$ relaxor ferroelectrics, weak electric-field properties as well as strong electric-field properties were investigated in the frequency range from 1 Hz to 100 kHz. The temperature dependence of the dielectric properties were measured under the low electric-field of 1 V/mm in the phase transition temperature range from $-40^{circ}C$ to $90^{circ}C$. The dielectric properties obtained from the slope of the dielectric hysteresis loop and the temperature dependence of the pyroelectric properties were also investigated. When fitting all the experimental data with the Vogel-Fulcher relation, experimental data were agreed with the equation closely. Thus, dielectric relaxations could be modeled by the Vogel-Fulcher relation not only for the low electric-field but also for the high electric-field.

Key words: Relaxation, $Pb(Mg_{1/3}Nb_{2/3})O_3$, Relaxor ferroelectrics, Hysteresis, Temperature dependence