Transparent polycrystalline cubic silicon nitride.

ABSTRACT: Glasses and single crystals have traditionally been used as optical windows. Recently, there has been a high demand for harder and tougher optical windows that are able to endure severe conditions. Transparent polycrystalline ceramics can fulfill this demand because of their superior mechanical properties. It is known that polycrystalline ceramics with a spinel structure in compositions of MgAl₂O₄ and aluminum oxynitride (γ-AlON) show high optical transparency. Here we report the synthesis of the hardest transparent spinel ceramic, i.e. polycrystalline cubic silicon nitride (c-Si₃N₄). This material shows an intrinsic optical transparency over a wide range of wavelengths below its band-gap energy (258 nm) and is categorized as one of the third har

SUBMITTER: Nishiyama N 

PROVIDER: S-EPMC5355983 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature