Boron phosphide

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Boron phosphide
ECHA InfoCard 100.039.616
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]
3.0 (0.63 µm)[1]
Zinc blende
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

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]


Crystals of boron phosphide were synthesized by Henri Moissan as early as in 1891.[4]


Pure BP is almost transparent, n-type crystals are orange-red whereas p-type ones are dark red.[5]

Chemical properties[edit]

BP is not attacked by acids or boiling aqueous alkali water solutions. It is only attacked by molten alkalis.[5]

Physical properties[edit]

Some properties of BP are listed below:[1][5]

  • 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)
  • record-high room temperature thermal conductivity of 460 W/mK was reported for very high quality single crystals

See also[edit]


  1. ^ a b c Madelung, O. (2004). Semiconductors: Data Handbook. Birkhäuser. pp. 84–86. ISBN 978-3-540-40488-0. 
  2. ^ Kang, J.; Wu, H.; Hu, Y. (2017). "Thermal Properties and Phonon Spectral Characterization of Synthetic Boron Phosphide for High Thermal Conductivity Applications". Nano Letters. 17: 7507. doi:10.1021/acs.nanolett.7b03437. 
  3. ^ Popper, P.; Ingles, T. A. (1957). "Boron Phosphide, a III–V Compound of Zinc-Blende Structure". Nature. 179: 1075. doi:10.1038/1791075a0. 
  4. ^ Moissan, H. (1891). "Préparation et Propriétés des Phosphures de Bore". Comptes Rendus. 113: 726–729. 
  5. ^ a b c Berger, L. I. (1996). Semiconductor Materials. CRC Press. p. 116. ISBN 978-0-8493-8912-2. 

Further reading[edit]

  • King, R. B., ed. (1999). Boron Chemistry at the Millennium. Elsevier Science & Technology. ISBN 0-444-72006-5. 
  • US patent 6831304, Takashi, U., "P-N Junction Type Boron Phosphide-Based Semiconductor Light-Emitting Device and Production Method thereof", issued 2004-12-14, assigned to Showa Denko 
  • Stone, B.; Hill, D. (1960). "Semiconducting Properties of Cubic Boron Phosphide". Physical Review Letters. 4 (6): 282–284. doi:10.1103/PhysRevLett.4.282.