Boron nitride

Boron nitride
Names
	IUPAC name Boron nitride
Identifiers
CAS Number	10043-11-5 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:50883 ;
ChemSpider	59612 ;
ECHA InfoCard	100.030.111
EC Number	233-136-6;
Gmelin Reference	216
MeSH	Elbor
PubChem CID	66227;
RTECS number	ED7800000;
UNII	2U4T60A6YD ;
CompTox Dashboard (EPA)	DTXSID5051498 ;
	InChI InChI=1S/BN/c1-2 Key: PZNSFCLAULLKQX-UHFFFAOYSA-N ; InChI=1S/B2N2/c1-3-2-4-1 Key: AMPXHBZZESCUCE-UHFFFAOYSA-N; InChI=1S/B3N3/c1-4-2-6-3-5-1 Key: WHDCVGLBMWOYDC-UHFFFAOYSA-N; InChI=1/BN/c1-2 Key: PZNSFCLAULLKQX-UHFFFAOYAL;
	SMILES B#N;
Properties
Chemical formula	BN
Molar mass	24.82 g/mol
Appearance	Colorless crystals
Density	2.1 g/cm3 (h-BN); 3.45 g/cm3 (c-BN)
Melting point	2,973 °C (5,383 °F; 3,246 K) sublimates (c-BN)
Solubility in water	Insoluble
Electron mobility	200 cm2/(V·s) (c-BN)
Refractive index (nD)	1.8 (h-BN); 2.1 (c-BN)
Structure
Crystal structure	Hexagonal, sphalerite, wurtzite
Thermochemistry
Heat capacity (C)	19.7 J/(K·mol)
Std molar; entropy (S⦵298)	14.8 J/K mol
Std enthalpy of; formation (ΔfH⦵298)	−254.4 kJ/mol
Gibbs free energy (ΔfG⦵)	−228.4 kJ/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H319, H335, H413
Precautionary statements	P261, P264, P271, P273, P280, P304+P340, P305+P351+P338, P312, P337+P313, P403+P233, P405, P501
NFPA 704 (fire diamond)	0 0 0
Related compounds
Related compounds	Boron arsenide; Boron carbide; Boron phosphide; Boron trioxide;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Boron nitride is a thermally and chemically resistant refractory compound of boron and nitrogen with the chemical formula B N. It exists in various crystalline forms that are isoelectronic to a similarly structured carbon lattice. The hexagonal form corresponding to graphite is the most stable and soft among BN polymorphs, and is therefore used as a lubricant and an additive to cosmetic products. The cubic (zincblende aka sphalerite structure) variety analogous to diamond is called c-BN; it is softer than diamond, but its thermal and chemical stability is superior. The rare wurtzite BN modification is similar to lonsdaleite but slightly harder than the cubic form. It is 18 percent stronger than diamond.^[3]

Because of excellent thermal and chemical stability, boron nitride ceramics are used in high-temperature equipment and metal casting. Boron nitride has potential use in nanotechnology.

^ ^a ^b ^c ^d for h-BN
^ ^a ^b ^c ^d Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, Florida: CRC Press. p. 5.6. ISBN 1-4398-5511-0.
^ Brazhkin, Vadim V.; Solozhenko, Vladimir L. (2019). "Myths about new ultrahard phases: Why materials that are significantly superior to diamond in elastic moduli and hardness are impossible". Journal of Applied Physics. 125 (13): 130901. arXiv:1811.09503. Bibcode:2019JAP...125m0901B. doi:10.1063/1.5082739. S2CID 85517548.

[auto-1] r h-BN

[b92t-2] Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, Florida: CRC Press. p. 5.6. ISBN 1-4398-5511-0.

[ReferenceA-3] Brazhkin, Vadim V.; Solozhenko, Vladimir L. (2019). "Myths about new ultrahard phases: Why materials that are significantly superior to diamond in elastic moduli and hardness are impossible". Journal of Applied Physics. 125 (13): 130901. arXiv:1811.09503. Bibcode:2019JAP...125m0901B. doi:10.1063/1.5082739. S2CID 85517548.

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