Effects of Lanthanum Substitution on Dielectric, Ferroelectric and Electro-Optic Properties of Slim-Loop PLZT Ceramics

Abstract:

Highly transparent lead lanthanum zirconate titanate (Pb_1−xLa_x)(Zr_0.65Ti_0.35)_1-x/4O₃ (x=0.096-0.1) electro-optic ceramics were prepared by the hot pressing method. The ceramics exhibited transparency as high as 67% at 632.8nm (close to the theoretical value). The effects of lanthanum substitution on the phase structure, microstructure, dielectric, ferroelectric, optical and electro-optic properties of PLZT were examined systematically. The XRD results indicated that all the compositions were single perovskite phases, and La substitution decreased the lattice constant and unit-cell volume. The dielectric results showed that the T_max and ε_max decreased with La content increasing. The hysteresis loops showed that the La content reduced saturate polarization (Ps), remnant polarization (Pr) and coercive field (Ec). Moreover, the half-wave voltage and EO coefficient R was enhanced and reduced respectively with increasing La.

• Periodical: Materials Science Forum (Volume 913)
• Pages: 459-465
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.913.459
• Online since: February 2018
• Authors: Xia Zeng, Wen Xiu Cheng, Ping Sun Qiu, Xi Yun He*
• Keywords: Electro-Optic Properties, Ferroelectric Properties, La Substitution, Transparent Ceramics

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