Lithium phosphide

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Lithium phosphide
Names
Other names
Trilithium phosphide
Identifiers
3D model (
JSmol
)
ChemSpider
ECHA InfoCard
 100.031.824 Edit this at Wikidata
EC Number
  • 235-020-0
  • InChI=1S/3Li.H2P/h;;;1H2/q3*+1;-1
    Key: IEAMEDSGNMSUND-UHFFFAOYSA-N
  • [Li+].[Li+].[Li+].[PH2-]
Properties
Li3P
Molar mass 51.79 g·mol−1
Appearance Red-brown crystals
Density 1.43
Structure
cubic
Related compounds
Other cations
 Scandium phosphide
Lanthanum phosphide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Lithium phosphide is an inorganic compound of lithium and phosphorus with the chemical formula Li
3P. This dark colored compound is formally the Li+ salt of P3-. It is a hazardous to handle because of its high reactivity toward air.[1]

Synthesis

Heating

red phosphorus and lithium in an argon atmosphere:[1]

12Li + P4 → 4Li3P

Reaction of monolithium phosphide and lithium:

LiP + 2Li → Li3P

Physical and chemical properties

Lithium phosphide forms red-brown crystals of hexagonal systems, space group P63/mmc,[2] cell parameters a = 0.4264 nm, c = 0.7579 nm, Z = 2.[3][4]

The compound react with water to release phosphine:[5]

Li3P + 3H2O → 3LiOH + PH3

Uses

The compound is proposed to be used as a potential electrolyte for solid-state devices.[6]

Related compounds

Reaction of lithium with red phosphorus at 870 °C gives Li3P7.[7]

Further reading

  • Nazri, Gholamabbas (1 April 1989). "Preparation, structure and ionic conductivity of lithium phosphide".
    doi:10.1016/0167-2738(89)90438-4
    .

Safety

Alkali metal phosphides are dangerous compounds when exposed to oxygen or moisture.[8]

References

  1. ^ a b E. Donges (1963). "Phosphides, Arsenides, Antimonides and Bismuthides of Alkali Metals from the Elements". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 2. NY, NY: Academic Press. p. 985.
  2. materialsproject.org
    . Retrieved 10 December 2021.
  3. doi:10.1557/PROC-210-155
    . Retrieved 10 December 2021.
  4. ^ Donnay, Joseph Désiré Hubert (1963). Crystal Data; Determinative Tables. American Crystallographic Association. p. 765. Retrieved 10 December 2021.
  5. doi:10.1107/S1600536807008422
    .
  6. ISBN 978-1-83916-260-2
    . Retrieved 10 December 2021.
  7. doi:10.1002/zaac.19865390810
    .
  8. U.S. Government Printing Office
    . 1979. p. 9. Retrieved 10 December 2021.
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