Ce-doped (Y,Gd)₃Al₅O₁₂ nanoceramics were fabricated by the method of hot-pressing sintering of glass microspheres followed by heat treatment. Glass microspheres prepared by the flame spraying-water quenching technique possess a high tendency toward crystallization. Crystallization below the onset crystallization temperature is observed when the glass microspheres were hot pressed. Nanostructured Ce-doped (Y,Gd)₃Al₅O₁₂ ceramics can be obtained when the sintered bulk samples were annealed at temperatures below 1200 °C. The relative density of prepared nanoceramics increases with increasing annealing temperatures and Gd contents and it can reaches about 95%. The effects of annealing temperature and Gd substitution on the luminescence properties of prepared samples were investigated.

Materials Research Bulletin, 2015

(a) Low magnification SEM image of the prepared microspheres and (b) high magnification SEM image of a crystalline microsphere.