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Boron nitride

From Academic Kids

Properties
General
Name Boron nitride
Chemical formula BN
Appearance White solid
Physical
Formula weight 24.8 amu
Boiling point sublimes at 3273 K (3000 C)
Density 2.2 ×103 kg/m3
Crystal structure zinc blende or layered
Solubility insoluble
Thermochemistry
ΔfH0gas 476.98 kJ/mol
ΔfH0solid -250.91 kJ/mol
S0gas, 1 bar 212.36 J/molK
S0solid 14.77 J/molK
Safety
Ingestion Classified "not hazardous"
Inhalation  ?
Skin  ?
Eyes  ?
More info  ?
SI units were used where possible. Unless otherwise stated, standard conditions were used.

Disclaimer and references

Boron nitride is a binary chemical compound, consisting of equal proportions of boron and nitrogen, with formula BN. Structurally, it is isoelectronic to carbon and takes on similar physical forms: a graphite-like one, and a diamond-like one. The latter is one of the hardest materials known, behind diamond and ultrahard fullerite. It is widely used for grinding and as material for tools in industry, partly because it does not dissolve into iron, nickel and related alloys at high temperatures, but diamond does. Theoretical beta carbon nitride is thought to be harder. Hexagonal boron nitride finds use as a high-temperature lubricant where the electrical conductivity or reactivity of graphite would be problematic.

It can also be synthesized in forms analogous to carbon nanotubes, but with a more uniform electronic band gap and the potential for piezoelectric activity.de:Bornitrid es:Nitruro de boro nl:Boornitride ja:窒化ホウ素

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