Boron phosphide
Chemical compound From Wikipedia, the free encyclopedia
Boron phosphide (BP) (also referred to as boron monophosphide, to distinguish it from boron subphosphide, B12P2) is a chemical compound of boron and phosphorus. It is a semiconductor.[3]
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| Identifiers | |
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3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.039.616 |
| EC Number |
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PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| BP | |
| Molar mass | 41.7855 g/mol |
| Appearance | maroon powder |
| Density | 2.90 g/cm3 |
| Melting point | 1,100 °C (2,010 °F; 1,370 K) (decomposes) |
| Band gap | 2.1 eV (indirect, 300 K)[1] |
| Thermal conductivity | 4.6 W/(cm·K) (300 K)[2] |
Refractive index (nD) |
3.0 (0.63 μm)[1] |
| Structure | |
| Zinc blende | |
| F43m | |
| Tetrahedral | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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History
Crystals of boron phosphide were synthesized by Henri Moissan as early as 1891.[4]
Appearance
Pure BP is almost transparent, n-type crystals are orange-red whereas p-type ones are dark red.[5]
Chemical properties
BP is not attacked by acids or boiling aqueous alkali water solutions. It is only attacked by molten alkalis.[5]
Physical properties
BP is known to be chemically inert and exhibit very high thermal conductivity.[2] Some properties of BP are listed below:
- lattice constant 0.45383 nm
- coefficient of thermal expansion 3.65×10−6 /°C (400 K)
- heat capacity CP ~ 0.8 J/(g·K) (300 K)
- Debye temperature = 985 K
- Bulk modulus 152 GPa
- relatively high microhardness of 32 GPa (100 g load).
- electron and hole mobilities of a few hundred cm2/(V·s) (up to 500 for holes at 300 K)
- high thermal conductivity of ~ 460 W/(m·K) at room temperature[2]
See also
References
Further reading
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