Effects of Annealing on Properties of PLZT (8/68/32) Electrically Controlled Light Scattering Ceramics

PLZT (8/68/32) electrically controlled light scattering ceramics with fully dense microstructure and high transmittance were prepared by a hot-press sintering method. The effects of annealing on dielectric, ferroelectric, optical and electrically controlled light scattering properties were examined and analysed. The XRD patterns indicated that all sintered specimens were well crystallized and the peak of 2θ∼30.8° gradually shifted to high degree. The temperature dielectric spectrum manifested the obvious relax or phase transition. And the double-look-like ferroelectric hysteresis loops revealed the tendency to transform a slim loop with the significant reduction in remnant polarization and coercive field via annealing treatment. Then the transmittance (from 58 to 62%, E = 0, λ = 632.8 nm) and contrast ratio (from 545:1 to 699:1) clearly increased after annealing treatment. The light scattering behavior of the PLZT samples was improved obviously.