• Electrical & Electronic Materials
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• v.6 no.5
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• pp.454-460
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• 1993

본 연구에서는 준강유전 특성을 갖는 xBa(L $a_{1}$2/N $b_{1}$2/) $O_{3}$- (1-x)Pb(Z $r_{y}$ $Ti_{1-y}$) $O_{3}$ (x=8.5, 9.0[mol.%], y=65, 70[mol.%]) 세라믹을 2단 소성법으로 제작한 후, 조성 및 인가전계에 따른 전기광학 특성 및 광변조 특성을 측정하였다. 인가전계가 증가함에 따라 8.5/65/35 시편을 제외한 전조성에서 유효복굴절이 2차 함수적으로 변화하는 2차 전기광학 특성을 나타내었으며 2차 전기광학계수, 반파장전압 및 ON-OFF ratio는 9.0/65/35 시편에서 각각 6.17x$10^{-16}$[ $m^{2}$/ $v^{2}$], 136[V], 252의 가장 우수한 값을 나타내었다. 9.0/70/30, 9.0/65/35 및 8.5/70/30 시편에 대해 광변조 특성을 측정한 결과, 입사광의 세기를 인가전압에 의해 변조시킬 수 있음을 관찰하였다.다.

• Proceedings of the KIEE Conference
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• 1987.11a
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• pp.213-215
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• 1987

In this paper, influences or grain size on the electro-optic properties were studied on the penferroelectric PLZT ceramics. The specimens were fabricated by the two stage sintering method. Relative permittivity was a little increased with the increment or grain size in 9,9.5/65/35 (La/Zr/Ti) PLZT specimens, and Curie temperature was decreased in the 9.5/65/35 specimens but constant in the 9.5/65/35 specimens. As the grain size was increased, field induced polarization and dP/dE were increased. Because domain walls can be easily moved by electric field. Light transmittance was increased in the 9/65/35 PLZT specimens but there was little effect on the grain size in the 9.5/65/35 PLZT specimens.

• Electrical & Electronic Materials
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• v.8 no.2
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• pp.190-195
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• 1995

Temperature dependences of the dielectric constant K(T), remanent polarization $P_{r}$, (T), effective birefringence overbar .DELTA.n(T), transmitted light intensity and quadratic electro optic coefficient R(T) of the two-stage sintered xBa(L $a_{1}$2/N $b_{1}$2/) $O_{3}$-(1-x)Pb(Z $r_{y}$ $Ti_{1-y}$) $O_{3}$(x=0.085, 0.09, 0.40.leq.y.leq.0.70) ceramics were investigated. Increasing the PbZr $O_{3}$ contents, the crystal structure of a specimen was changed from a tetragonal phase to a rhombohedral and cubic phase, and the phase transition was showed a diffuse phase transition(DPT) characteristics. In the compositions which located on the PE-FE phase boundary, the discrepancy was observed between the Curie temperature and temperature which a microscopic polarization and effective birefringence were disappeared.red.d.