부산대학교 도서관

The transparent Y2O3 ceramic was prepared in this work via vacuum sintering of Y2O3 nanopowder obtained by sulfuric acidassistedcalcination. The calcination temperature notably influenced the dispersion, morphology and sinterability of Y2O3nanopowders. The calcined powders at various temperatures showed similar shapes, primarily comprised of round particleswith an isotropic surface. Nevertheless, the particle size gradually increased as the calcination temperature was raised. Thepowder calcined at 1100 ℃ showed a lower agglomerate state (n = 2.19) and better sintering properties instead of thoseobtained at other calcination temperatures, which can be correlated with a larger specific surface area at the low temperatureof <1100 ℃ and the rapid growth of large particles at 1200 ℃, respectively. The powder, calcined at 1100 ℃ was vacuumsintered in transparent ceramics for 5 h at a temperature of 1700 ℃. The transparent ceramic exhibited a dense and uniformmicrostructure, and the 1.5 mm thick sample has an inline transmission of up to 70% at 800 nm wavelength