Sapphire is a high-purity and high-density, single-crystalline form of aluminum oxide that may contain chromia, titania, yttria, or other dopants. Sapphire is usually transparent or translucent.
An international team of scientists have combined cyclic-olefin copolymers with a powder of aluminum oxide to create a filament that can be used by a 3D printer to create anti-reflective covers ...
THE formation of boehmite on anodized and non-anodized aluminium surfaces by boiling-water treatment has been discussed by Hart 1. He found by electron diffraction study of ammonium borate anodic ...