Lanthanum phosphide

Lanthanum phosphide is an inorganic compound of lanthanum and phosphorus with the chemical formula LaP.[1][2][3]

Lanthanum phosphide
Names
Other names
Phosphanylidynelanthanum
Identifiers
3D model (JSmol)
ECHA InfoCard 100.042.515
EC Number
  • 246-782-9
  • InChI=1S/La.P
    Key: GZHCNRONBGZNAH-UHFFFAOYSA-N
  • P#[La]
Properties
LaP
Molar mass 169.88
Appearance Black crystals
Density 5.2 g/cm3
Reacts with water
Structure
Cubic
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Synthesis

Lanthanum phosphide can be made by heating lanthanum metal with excess phosphorus in a vacuum:[4]

4 La + P4 → 4 LaP

Physical properties

Lanthanum phosphide forms black crystals of a cubic system, space group Fm3m, cell parameters a = 0.601 nm, with number of formulas per unit cell Z = 4.

The crystals are very unstable and decompose in the open air.

Chemical properties

Lanthanum phosphide reacts with water, releasing highly toxic phosphine gas:

LaP + 3H2O → La(OH)3 + PH3

Uses

Lanthanum phosphide compound is a semiconductor used in high power, high frequency applications, and in laser diodes.[1][5][6]

Lanthanum polyphosphide

In addition to the simple phosphide, LaP, lanthanum and phosphorus can also form phosphorus-rich compounds such as LaP5[7] and LaP7.

References
  1. "Lanthanum Phosphide". American Elements. Retrieved 21 December 2021.
  2. NBS Monograph. National Bureau of Standards. 1959. p. 189. Retrieved 21 December 2021.
  3. Standard X-ray Diffraction Powder Patterns. U.S. Department of Commerce, National Bureau of Standards. 1953. p. 69. Retrieved 21 December 2021.
  4. Journal of General Chemistry of the U.S.S.R. in English Translation. Consultants Bureau. 1963. p. 2729. Retrieved 21 December 2021.
  5. Lewis, Robert A. (30 March 2016). Hawley's Condensed Chemical Dictionary. John Wiley & Sons. ISBN 978-1-119-19372-2. Retrieved 21 December 2021.
  6. O'Bannon, Loran (6 December 2012). Dictionary of Ceramic Science and Engineering. Springer Science & Business Media. p. 151. ISBN 978-1-4613-2655-7. Retrieved 21 December 2021.
  7. Wichelhaus, W.; Schnering, H. (1976). "Zur Chemie und Strukturchemie der Phosphide und Polyphosphide. 12. Die Pentaphosphide des Lanthans und Neodyms, LaP5 und NdP5". Zeitschrift für Anorganische und Allgemeine Chemie. 419: 77–86. doi:10.1002/ZAAC.19764190113. S2CID 97289383.
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