Boron nitride

Boron nitride is a compound of boron and nitrogen that crystallizes in several structures, including soft, layered hexagonal forms and extremely hard cubic forms.

Hexagonal boron nitride: A layered boron nitride structure with graphite-like sheets and weak forces between them. Its weakly bound layers account for the soft, slippery behavior of boron nitride.
Chemical vapor deposition: A process that forms solid films by reacting gaseous precursors at a surface. It produces controlled boron nitride coatings and thin films.
Cubic boron nitride tool: A cutting or grinding tool whose abrasive edge contains cubic boron nitride. Its hardness and heat resistance suit machining hard ferrous alloys.
Diamond: A crystalline form of carbon in which each atom is tetrahedrally bonded to four neighbors. Diamond is harder, while cubic boron nitride can better withstand chemical attack by ferrous metals.
Cubic boron nitride: A three-dimensional boron nitride structure in which each atom is tetrahedrally bonded. Its rigid tetrahedral network makes this form exceptionally hard.
High-pressure high-temperature synthesis: A materials synthesis method that uses extreme pressure and temperature to promote phase formation. It converts hexagonal boron nitride into cubic boron nitride.
Boron nitride lubricant: A solid lubricant made from boron nitride, commonly in hexagonal form. Its layers shear readily, reducing friction where liquid lubricants are unsuitable.
Graphite: A layered crystalline form of carbon with weakly interacting sheets of strongly bonded atoms. Hexagonal boron nitride resembles graphite structurally but differs in color and electronic behavior.
Wurtzite boron nitride: A metastable boron nitride structure with a hexagonal lattice and tetrahedral bonding. This less common structure combines hexagonal symmetry with strong three-dimensional bonds.
Layered material: A solid whose atoms form strongly bonded sheets held together by weaker interlayer forces. Hexagonal boron nitride shares this architecture with graphite and other sheet materials.

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