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.
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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 ...