| Summary: | In this work, the relationship between tetragonal to monoclinic phase transformation and
Photoluminescence (PL) spectrum were studied for 3 mol% YSZ samples sintered in air and argon atmosphere
at 1500°C. Low temperature degradation study was c?nducted under autoclave condition containing superheated
steam at 180°C and 10 bar vapour pressure for penods up to 12 hours. Photoluminescence (PL) studies was
conducted by using a PL spectroscope with He-Cd laser at a wavelength of 325 nm as the excitation Source and
the phase content in the zirconia samples was measured using X-ray diffractometer (XRD). The studies
concluded that argon gas sintered samples hav~ higher st:uc~ural vacancy than air sintered sample, argon gas
sintered sample showed rapid phase transformation than arr smtered sample, and that the defect associated with
oxygen vacancies in the zirconia lattice increases with increasing ageing time
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