The relationship between optical scattering losses and microstructure, especially inside pores distribution, was studied in
transparent Nd:YAG and Yb:YAG ceramics. Specimens with different transmittance values were fabricated by vacuum
sintering from 1730°C to 1760°C for 30 to 50 h through a solid-state reaction method. Light scattering losses were
calculated from transmittance values measured by UV-Vis-IR spectrophotometer. Micromechanism, including inside
pores and grains on etched surfaces, was characterized via high magnification optical microscope. The porosities were
also counted in microscope observation. Curves of the relations between scattering losses (or transmittances) and
porosities were obtained. In addition, the genesis of inside pores and the process of exhaust were discussed in this paper.
Photoluminescence performances of Pr-doped alkaline-earth titanates (Ba,Ca)TiO3 (with rich barium) prepared by a solgel
technique are investigated at room temperature. A relatively strong red luminescence is observed in
(Ba0.80Ca0.20)TiO3 material when Pr-BaTiO3 material does not exhibit obvious red luminescence. The phenomenon is
discussed with respect to the substitute of Ca and the two-photon luminescence effect. The red luminescence is enhanced
by a fast thermal treatment. The wavelength range of luminescence near red and infrared light is broadened by the same
process as well. These behaviors are ascribed to the randomization of distribution of Ca and Ba at A site in ABO3
perovskite structure. The experimental results provide not only a possible way to develop new materials with pastel
visual impression, but also a potential technique to modify photoluminescence properties that can be controlled by
external fields because the microscopic structure of BaTiO3, such as electric domains, can be changed by electric field,
temperature, and so on.
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