Electro-Optical Properties of PLZT Transparent Ceramics with Composition Regulating in Micro-Regions and Gradient Designing
Lanthanide-doped lead zirconate titanate(PLZT)transparent ceramics have significant potential for application in modern optical communication and high energy laser technology due to their exceptional optical transparency and electro-optical effects.However,the electro-optical(E-O)properties of PLZT transparent ceramics are highly sensitive to changes of ambient temperature,which presents a significant challenge in their application in E-O modulators across a wide temperature range.The objective of this study was to investigate the effects of temperature on the ferroelectric,dielectric and E-O properties of PLZT(10/65/35)transparent ceramics,and optimize the material E-O properties and their temperature stability by regulating the distribution of the key doping element La3+in micro regions.A series of PLZT ceramic samples with pure perovskite structures were obtained by a conventional hot-press sintering process in oxygen atmosphere.The resulting microstructures are uniform and dense,and the optical transmittances of the samples are 52％～60％at a wavelength of 632.8 nm.The broadened dielectric peaks of PLZT ceramics indicate the relaxation characteristics of the materials,and it is promoted as La3+content increasing,and enhance obviously by the enlarged La3+fluctuation in micro-regions in the 0-3 and 2-2 composite PLZT ceramics with a more broadened dielectric peak and higher dielectric constant.The ferroelectric hysteresis loops(P-E)of the PLZT ceramics all exhibit a gradual decrease in maximum polarization value(Pmax),residual polarization value(Pr),and coercivity field strength(Ec)with the temperature increasing.Pmax values of 0-3 and 2-2 composite PLZT(10/65/35)ceramics are obviously higher than that of the well-distributed PLZT(10/65/35)ceramics,and their equivalent secondary E-O coefficients are significantly increased near the temperature of diffuse phase transition.
transparent ceramicslanthanide-doped lead zirconate titanate(PLZT)gradient designtemperature stabilityelectro-optical coefficientferroelectric propertytransmittance
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