Photoluminescence in yttria-stabilized zirconia of aging effects

Abstract

Photoluminescence properties are studied on yttria-stabilized zirconia (YSZ) samples aged up to 1000 h at the temperature of 1073 K where the aging-induced decrease in conductivity is reported. Multiple peaks are observed under irradiation of sub-band-gap light of 3.81 eV by a He-Cd laser. Their intensities depend on aging time, and the aging-time developments of the intensities are characterized by two regions. One of these time regions exhibits large deviation and deformation of the aging-time behavior. The deformation is observed at the region of the first few hundred hours of aging for 8 and 10YSZ. The time region with deformation coincides with that of the main decrease in conductivity. The other time region without deformation contains two types of mutually complementary behavior for 8YSZ or exhibits slow and smaller change in the intensities for 10YSZ.