Among many kinds of transparent ceramics, polycrystalline gamma-aluminum oxynitride (γ-AlON) exhibits superior optical and mechanical properties to MgAl 2 O 4 (Mg-spinel), ZnS, MgO, and Y 2 O 3 , which are even comparable to those of sapphire. Due to its high strength, hardness, and wide transmittance range from the UV to mid-IR (0.2 – 5.2 µm), γ-AlON is being applied to IR cameras, scratch-resistant windows, missile domes, transparent armor, and others, especially with increasing demand nowadays. This report discusses the basic formation mechanism of transparent γ-AlON from the Al 2 O 3 and AlN starting materials as well as its stoichiometry based on a proposed constant anion model. In addition, the results from authors’ own research, including the effects of 2-step pressureless sintering and rare earth sintering additive on the properties of γ-AlON, are explained. We hope that this article helps expanding readers’ understanding on transparent ceramics as well as establishing research direction for further breakthrough of transparent polycrystalline γ -AlON.
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