Variations of Ferroelectric Properties by Unit Cell Distortion of Pb(Zr, Ti)O3-Pb(Co, Nb)O3 Solid Solution in Morphotropic Phase Boundary

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J. Korean Ceram. Soc. > Volume 25(6); 1988 > Article

Journal of the Korean Ceramic Society 1988;25(6): 694.

Morphotropic Phase Boundary 영역의 Pb(Zr, Ti)O3-Pb(Co, Nb)O3계 고용체의 격자변형에 따른 강유전 특성 변화

이전국, 정형진

한국과학기술원 무기재료연구실

Variations of Ferroelectric Properties by Unit Cell Distortion of Pb(Zr, Ti)O3-Pb(Co, Nb)O3 Solid Solution in Morphotropic Phase Boundary

ABSTRACT

Pb(Zr, Ti)O3-Pb(Co, Nb)O3 systems were investigated by x-ray diffraction method. System contains rhombohedral, tetragonal, and pseudocubic structures at room temperature. Crystal symmetry was changed from 4-fold symmetry to 3-fold symmetry by substituting Pb(Co1/3, Nb2/3)O3 ; PCN, to Pb(Zr0.52, Ti0.48)O3 ; PZT. As the substituted PCN concentration was increased, an increase in a-axis direction and a decrease in c-axis in the perovskite structure were occurred simultaneously, so that the crystal symmetry was changed into such way. In the higher sinteringtemperatures, the unit cell distortions occurred rather in the lower substitution range of PCN. The ferroelectric properties were maximized at the region that tetragonal and rhombohedral or pseudocubic structures were coexist.