Abstract
Transparent aluminium oxynitride (AlON) ceramics were prepared by hot isostatic pressing (HIP) with 0.08~0.14 wt% Y2O3 or 0.01~0.04 wt% La2O3 as sintering additives. Both Y2O3 and La2O3 additives prompted sintering process and accelerated grain growth. When higher amount of Y2O3 (0.12 wt%) or La2O3 (0.03 wt%) additives were doped, extensive twins occurred accompanied with the coarsing of grain size (~100μm). Electron backscatter diffraction (EBSD) analysis showed that twin boundaries increased with the increasing of Y2O3/La2O3 concentrations. By co-doping of Y2O3 -La2O3 additives with reduced doping level, the formation of twins was successfully suppressed, which was necessary to limit the additional light scattering of twin boundaries.
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