Chemical Property of Boron nitride
Chemical Property:
- Appearance/Colour:white powder
- Melting Point:2700oC (sublimes)
- Boiling Point:sublimes sl below 3000℃ [MER06]
- PSA：23.79000
- Density:2.29 g/cm3
- LogP:-0.90112
- Storage Temp.:-20°C
- Sensitive.:Hygroscopic
- Water Solubility.:Soluble in water (slightly soluble) at 20°C, and water (soluble) at 95°C.
- Hydrogen Bond Donor Count:0
- Hydrogen Bond Acceptor Count:1
- Rotatable Bond Count:0
- Exact Mass:25.0123792
- Heavy Atom Count:2
- Complexity:10
- Purity/Quality:
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99.2% *data from raw suppliers
Boron nitride, hexagonal crystalline solid, min. 99% *data from reagent suppliers
Safty Information:
- Pictogram(s):
Xi
- Hazard Codes:Xi
- Statements:
36/37
- Safety Statements:
26-36
- MSDS Files:
-
SDS file from LookChem
Total 1 MSDS from other Authors
Useful:
- Chemical Classes:Metals -> Metalloid Compounds (Boron)
- Canonical SMILES:B#N
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Description
Boron nitride is a material in which the extra electron of nitrogen (with respect to carbon) enables it to form structures that are isoelectronic with carbon allotropes.Boron nitride is an inorganic compound with a flat, hexagonal crystal similar to graphite, but with the carbon atoms replaced by boron and nitrogen atoms. The alternate boron and nitrogen atoms are linked to form interlocking hexagonal rings with three boron atoms and three nitrogen atoms, and the layers are held together by van der Waals forces. There is no boron-nitrogen bonding between the layers.The bond length is 1.466? and the interlayer spacing is 3.331 ?. A spherical form (with a hexagonal crystal structure) is also available.Boron nitride can also be in cubic form in which alternately linked boron and nitrogen atoms form a tetrahedral bond network, similar to carbon atoms in diamond.
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Physical properties
White powder, hexagonal graphite-like form or cubic crystal; cubic form similar to diamond in its crystal structure, and reverts to graphite form when heated above 1,700°C; density 2.18 g/cm3; melts at 2,975°C (under nitrogen pressure); sublimes at 2,500°C at atmospheric pressure; insoluble in water and acid; attacked by hot alkalies and fused alkali carbonates; not wetted by most molten metals or glasses.Cubic boron nitride (c-BN) does not exist in nature but it is a novel substance created by human. It is synthesized under high pressure and high temperature just like diamond counterpart and has the wurzite crystal structure. The tables below compare reference hardness and heat conductivity for a couple of abrasive materials. Apparently c-BN is excellent in these properties, second only to diamond, the highest.
Substance
Hardness VHN (Vickers)
Heat Conductivity (W/(m.K))
diamond
8600
1000
- 2000
c-BN
5000
590
alumina
2300
6
tungsten
carbide
1800
42
silicon carbide
800
85
titanium nitride
2100
7.4
titanium carbide
3000
5.2 www.tomeidiamond.co.jp
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Uses
Boron nitride is a material in which the extra electron of nitrogen (with respect to carbon) enables it to form structures that are isoelectronic with carbon allotropes. Also used in manufacture of alloys; in semiconductors, nuclear reactors, lubricants.Hexagonal boron nitride can be used as an electrical insulator; as thermocouple protection sheaths, crucibles and linings for reaction vessels; and as a coating for refractory molds used in glass forming and in superplastic forming of titanium. It can also be incorporated in ceramics, alloys, resins, plastics, and rubber to give them self-lubricating properties. Hexagonal boron nitride is used the formulation of coatings and paints for high temperature applications. It is also used as a substrate for semi-conductors, lens coatings, and transparent windows. https://www.cir-safety.org boron nitride is a synthetically manufactured white, talc-like powder that can reflect light, giving a product a sparkle effect. It is primarily used in color cosmetics to provide subtle shimmer; however, it can also be found in skin care formulations for enhancing product smoothness and slip. Boron nitride used in the manufacture of high-temperature equipment parts due to its excellent thermal and chemical stability. It is used as a lubricant and an additive to cosmetics, paints, dental cements and pencil leads. It is also used to provide self lubricating properties to ceramics, alloys, resins, plastics and rubbers. In addition to this, it has many industrial applications such as xerographic process, laser printers, oxygen sensors and proton conductors. Cubic boron nitride is used as an abrasive material.
