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Encyclopedia > Boron nitride
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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/mol·K
S0solid 14.77 J/mol·K
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 A chemical formula (also called molecular formula) is a concise way of expressing information about the atoms that constitute a particular chemical compound. ... General Name, Symbol, Number boron, B, 5 Chemical series metalloids Group, Period, Block 13, 2, p Appearance black Atomic mass 10. ... Jump to: navigation, search General Name, Symbol, Number nitrogen, N, 7 Chemical series nonmetals Group, Period, Block 15, 2, p Appearance colorless Atomic mass 14. ... Jump to: navigation, search Color is an important part of the visual arts. ... ... Jump to: navigation, search The unified atomic mass unit (u), or dalton (Da), is a small unit of mass used to express atomic masses and molecular masses. ... Jump to: navigation, search Allah is who made all of this. ... Jump to: navigation, search The kelvin (symbol: K) is the SI unit of temperature, and is one of the seven SI base units. ... The degree Celsius (°C or ℃ (Unicode 0x2103)) is a unit of temperature named after the Swedish astronomer Anders Celsius (1701–1744), who first proposed a similar system in 1742. ... Jump to: navigation, search Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... Jump to: navigation, search The international prototype, made of platinum-iridium, which is kept at the BIPM under conditions specified by the 1st CGPM in 1889. ... Jump to: navigation, search The metre or (in American English) meter (symbol: m) is the SI base unit of length. ... Jump to: navigation, search Rose des Sables (Sand Rose), formed of gypsum crystals In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. ... A solvent is a liquid that dissolves a solid, liquid, or gaseous solute, resulting in a solution. ... Jump to: navigation, search ... Jump to: navigation, search The joule (symbol: J) is the SI unit of energy, or work. ... Jump to: navigation, search The mole (symbol: mol) is the SI base unit of the amount of particulate substance. ... Jump to: navigation, search In chemistry, the standard molar entropy is the entropy content of one mole of substance, under conditions of standard temperature and pressure. ... Jump to: navigation, search The International System of Units (abbreviated SI from the French language name Système International dUnités) is the most widely used system of units. ... Temperature and air pressure can vary from one place to another on the Earth, and can also vary in the same place with time. ... This page refers to the data given in chemical compound property tables. ...

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 hexagonal, graphite-like one, and a cubic, diamond-like one. Cubic boron nitride is one of the hardest materials known, behind only diamond and ultrahard fullerite. It is widely used for grinding and as a material for tools in industry. This is in part because it does not dissolve into iron, nickel, and related alloys at high temperatures like diamond does. Hexagonal boron nitride finds use as a high-temperature lubricant where the electrical conductivity or reactivity of graphite would be problematic. A binary compound is a chemical compound consisting of only two different elements. ... General Name, Symbol, Number boron, B, 5 Chemical series metalloids Group, Period, Block 13, 2, p Appearance black Atomic mass 10. ... Jump to: navigation, search General Name, Symbol, Number nitrogen, N, 7 Chemical series nonmetals Group, Period, Block 15, 2, p Appearance colorless Atomic mass 14. ... Two or more molecular entities (atoms, molecules, ions) are described as isoelectronic if they have the same number of valence electrons and the same structure (number and connectivity of atoms), but may differ in the elements involved. ... Jump to: navigation, search General Name, Symbol, Number carbon, C, 6 Chemical series nonmetals Group, Period, Block 14, 2, p Appearance black (graphite) colorless (diamond) Atomic mass 12. ... Jump to: navigation, search Graphite (named by Abraham Gottlob Werner in 1789, from the Greek γραφειν: to draw/write, for its use in pencils) is one of the allotropes of carbon. ... Jump to: navigation, search A scattering of round-brilliant cut diamonds shows off the many reflecting facets. ... Jump to: navigation, search Scratch caused by ultrahard fullerite on diamond Ultrahard fullerite (C60) is a form of carbon found to be harder than diamond, and which can be used to create even harder materials, such as aggregated diamond nanorods. ... Jump to: navigation, search General Name, Symbol, Number iron, Fe, 26 Chemical series transition metals Group, Period, Block 8, 4, d Appearance lustrous metallic with a grayish tinge Atomic mass 55. ... Jump to: navigation, search General Name, Symbol, Number nickel, Ni, 28 Chemical series transition metals Group, Period, Block 10, 4, d Appearance lustrous, metallic Atomic mass 58. ... An alloy is a combination, either in solution or compound, of two or more elements, at least one of which is a metal, and where the resultant material has metallic properties. ...


Boron nitride can also be synthesized in forms analogous to carbon nanotubes, but with a more uniform electronic band gap and the potential for piezoelectric activity. An electronic device known as a diode can be formed by joining two nanoscale carbon tubes with different electronic properties. ... In solid state physics and related applied fields, the band gap is the energy difference between the top of the valence band and the bottom of the conduction band in insulators and semiconductors. ... Piezoelectricity is the ability of certain crystals to produce a voltage when subjected to mechanical stress. ...


Synthesis

Hexagonal boron nitride is produced by the nitridation or ammonolysis of boron trioxide. Cubic boron nitride is produced by treating hexagonal boron nitride at high pressure and temperature, much as synthetic diamond is produced from graphite. Jump to: navigation, search Boron oxide is a colourless or white solid, also known as diboron trioxide, formula B2O3. ... Jump to: navigation, search Synthetic diamond is diamond produced through chemical or physical processes in a laboratory. ...


See also


  Results from FactBites:
 
boron nitride: Definition and Much More from Answers.com (1230 words)
Boron nitride (BN) is a binary chemical compound, consisting of equal proportions of boron and nitrogen.
Boron nitride is isoelectronic to the elemental forms of carbon and isomorphism occurs between the two species.
That is boron nitride possess three polymorphic forms; one analogous to diamond, one analogous to graphite and ones analogous to the fullerenes.
  More results at FactBites »

 
 

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