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 BN. 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 softer than the cubic form.^[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, FL: 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, FL: 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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