Effect of PbTiO3 Concentration on the Properties of <tex>$Pb(Mg_{1/3}Nb_{2/3})O_3-PbTiO_3$</tex> Relaxor Ferroelectrics -II. Phase Transition and Electric-field-induced Strains-

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J. Korean Ceram. Soc. > Volume 33(5); 1996 > Article

Journal of the Korean Ceramic Society 1996;33(5): 556.

$Pb(Mg_{1/3}Nb_{2/3})O_3-PbTiO_3$계 완화형 강유전체의 특성에 미치는 PbTiO3 첨가량의 영향 -II. 상전이 및 전계인가 변위특성-

박재환, 김인태, 김동영¹, 조서용, 흥국선, 박순자

서울대학교 무기재료공학과
¹서울대학교 무기재료공학

Effect of PbTiO3 Concentration on the Properties of $Pb(Mg_{1/3}Nb_{2/3})O_3-PbTiO_3$ Relaxor Ferroelectrics -II. Phase Transition and Electric-field-induced Strains-

ABSTRACT

In order to understand the electrostrictive behavior of Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) solid solutions the dielectric constants the electric-field-induced strains and the pyroelectric coefficients of (1-x)PMN-xPT (x=0.1-0.4) were investigated in the temperature range -50~20$0^{circ}C$. For x=0.1~0.35 where the phase transi-tion is diffusive the strain has a maxima at the temperature of maximum pyroelectric coefficient (depolrizing temperature) rather than the temperature of maximum dielectric constant. For x=0.4 where the phase transition is relatively sharp the strain decreases monotonically as the temperature increases. Relationships among the above experimental results are discussed.

Key words: $Pb(Mg_{1/3}Nb_{2/3})O_3-PbTiO_3$, Electrostrictive, Relaxor, Strain, Phase transition