Europium(III) phosphide

Europium phosphide is an inorganic compound of europium and phosphorus with the chemical formula EuP.[2][3][4] Other phosphides are also known.[5]

Europium(III) phosphide
Other names
Phosphanylidyneeuropium, Europium phosphide[1]
3D model (JSmol)
ECHA InfoCard 100.044.780 Edit this at Wikidata
EC Number
  • 249-274-5
  • InChI=1S/Eu.P
  • P#[Eu]
Molar mass 182.94
Appearance Dark crystals
Density g/cm3
Melting point 2,200 °C (3,990 °F; 2,470 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).


Heating powdered europium and red phosphorus in an inert atmosphere or vacuum:[citation needed]

4 Eu + P4 → 4 EuP

Passing phosphine through a solution of europium in liquid ammonia:[6]

Eu + 2PH3 → Eu(PH2)2 + H2

Eu(PH2)2 is formed, which then decomposes to europium(III) phosphide and phosphine:[6][7]

2Eu(PH2)2 → 2EuP + 2PH3 + H2


Europium(III) phosphide forms dark crystals which are stable in air and do not dissolve in water. Like sodium chloride, it crystallizes cubically in the space group Fm3m with cell parameter a = 575.5 nm with four formula units per unit cell.[8] Europium(III) phosphide tends to form europium(II) oxide (EuO) in air,[9] and pure EuP shows Van Vleck paramagnetism. The vapor pressure of EuP is 133-266.6 Pa at 1273 K.[10]

Europium(III) phosphide actively reacts with nitric acid.[citation needed]


The compound is a semiconductor used in high power, high frequency applications and in laser diodes.[2]


  1. ^ "Europium phosphide". European Chemical Agency. Retrieved 15 December 2021.
  2. ^ a b "Europium Phosphide". American Elements. Retrieved 15 December 2021.
  3. ^ Pankratz, L. B. (1995). Bulletin 696. U.S. Government Printing Office. p. 279.
  4. ^ Toxic Substances Control Act (TSCA) Chemical Substance Inventory. Cumulative Supplement to the Initial Inventory: User Guide and Indices. United States Environmental Protection Agency. 1980. p. 172. Retrieved 15 December 2021.
  5. ^ Mironov, K.E.; Brygalina, G.P.; Vikorskii, V. N. (1974). "Magnetism of Europium phosphides". Proceedings of the Rare Earth Research Conference. Plenum Press. p. 105. Retrieved 15 December 2021.
  6. ^ a b Pytlewski, L. L.; Howell, J. K. (1 January 1967). "Preparation of Europium and ytterbium phosphides in liquid ammonia". Chemical Communications (24): 1280. doi:10.1039/C19670001280. Retrieved 15 December 2021.
  7. ^ J.K. Howell, L.L. Pytlewski (August 1970). "Thermal decomposition of europium and ytterbium dihydrogen phosphides". Inorganic and Nuclear Chemistry Letters. 6 (8): 681–686. doi:10.1016/0020-1650(70)80144-1.
  8. ^ Giacomo Bruzzone, Assunta Ferro Ruggiero, Giorgio L. Olcese (1964). "Sul comportamento di ittrio, europio e itterbio nei composti MX con i metalloidi del V e VI gruppo": 66–69. {{cite journal}}: Cite journal requires |journal= (help)CS1 maint: multiple names: authors list (link)
  9. ^ K. E. Mironov, G. P. Brygalina, V. N. Ikorskii (1974). "Magnetism of europium phosphides": 105–114. {{cite journal}}: Cite journal requires |journal= (help)CS1 maint: multiple names: authors list (link)
  10. ^ S. P. Gordienko, K. E. Mironov (1983). "Stability of europium monophosphide during heating in vacuum and its thermodynamic properties" (24): 131–133. {{cite journal}}: Cite journal requires |journal= (help)