Effect of (Ba1−xLax)TiO3 and (Pb1−xLax)TiO3 dopants in optical and dielectric properties of PMN-based transparent ceramics.

A relaxor electroceramic 0. 3 5 Pb ( Mg 1 / 3 Nb 2 / 3) O 3 – 0. 3 5 ( Pb 1 − 1. 5 x La x) TiO 3 –0.30- ( Ba 1 − 1. 5 x La x) TiO 3 (PMN–PLT–BLT) with x = 0.25, 0.50 and 0.75 was synthesized using the two combination methods of auto-combination and hot-pressing. Characterization of the crystal phase, microstructure, optical and dielectric properties of PMN–PLT–BLT was made primarily by X-ray diffraction and TEM and SEM methods. The pure perovskite crystals (rhombohedral and tetragonal) prepared at 8 5 0 ∘ C for 2 h calcination were revealed by using X-ray diffraction. The average optical transmittance of these electroceramics in the range between 450 nm and 900 nm is higher than 60% while in the IR region reached 100%. The PMN–PLT–BLT with x = 0.75 displays the highest transparency around 70% near 1100 nm. The microstructures and dielectric measurements show that these three electroceramics have densities of about 98.8% and exhibit a normal relaxation characteristic. [ABSTRACT FROM AUTHOR]