Relaxor ferroelectric 0.75(Pb 1-3x/2 La x)(Mg 1/3 Nb 2/3)O 3-0.25(Pb 1-3x/2 La x)TiO 3 (La 3+ :PMN-PT x/75/25, where x = 2.8, 3.0, 3.5, and 4.0 mol% of La 3+) transparent ceramics were fabricated by the combination of oxygen atmosphere pressureless sintering and hot-pressing sintering process. The optical transmittances of above four ceramics are higher than 60% at the wavelength of 500-900 nm. La 3+ :PMN-PT 3.0/75/25 exhibits the highest transparency around 70% at 900 nm which is very close to the theoretical transmittance 71%. Each of the four ceramics exhibits the pure perovskite phases. They show fully dense microstructures and their relative densities are higher than 99.8%. The ferroelectric and dielectric measurements indicate that these four ceramics exhibit relaxation characteristics. With increasing La 3+ content, (200) peak in XRD patterns shifts to higher angles and the average grain size increases, while the temperature T max corresponding to the maximum r , the remanent polarizations P r and coercive fields E c decrease gradually.

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