Boron nitride, or BN, is a chemical compound with equal numbers of boron and nitrogen atoms. The hexagonal form (HBN) corresponding to graphite is the softest and most stable form among BN polymorphs, and is therefore used as lubricant and an additive to cosmetic products. The cubic (CBN) variety analogous to diamond has high hardness which is inferior only to diamond. The rare wurtzite BN (WBN) modification is similar to lonsdaleite, and it may even be harder than CBN.
Because of excellent thermal and chemical stability, boron nitride ceramics are traditionally used as parts of high-temperature equipment. Boron nitride has potential use in nanotechnology. Nanotubes of BN can be produced that have a structure similar to that of carbon nanotubes, i.e. graphene (or BN) sheets rolled on themselves, but the properties are very different.
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Boron nitride ceramics are traditionally used as parts of high-temperature equipment.
Hexagonal BN (h-BN) Ceramic is used to make BN crucible.
Cubic boron nitride (c-BN) Cubic boron nitride is used as an abrasive.
CBN ceramic is an ideal material for heat spreaders.
Amorphous boron nitride (a-BN) Layers of amorphous boron nitride (a-BN) are used in some semiconductor devices.