Neodymium compounds: neodymium trichloride

neodymium symbol icon

The neodymium in neodymium trichloride formally is in the oxidation state 3.

Crystal structure of neodymium trichloride

Neodymium trichloride

  • Formula as often written: NdCl3
  • Hill system formula: Cl3Nd1
  • CAS registry number: [10024-93-8]
  • Formula weight: 250.598
  • Class: chloride


  • neodymium trichloride
  • neodymium(III) chloride
  • neodymium chloride

Physical properties

  • Colour: mauve
  • Appearance: crystalline solid
  • Melting point: 758°C
  • Boiling point: 1600°C
  • Density: 4130 kg m-3


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Element analysis

Element percentages for the elements in neodymium trichloride
Element %
Cl 42.44
Nd 57.56


Nd2O3 + 6NH4Cl → 2NdCl3 + 3H2O + 6NH3

Pure anhydrous chloride neodymium(III) chloride may be made by heating a mixture of solid neodymium oxide, Nd2O3, and ammonium chloride. This is folloiwed by extended heating under vacuum at 300-320°C to remove excess ammonium chloride. The product is moisture sensitive and formed as a powder. Pure samples of other lanthanide chlorides can be made in similar fashion.

Solid state structure

  • Geometry of neodymium: 9 coordinate: tricapped trigonal prismatic
  • Prototypical structure:

Crystal structure of neodymium trichloride

Isotope pattern

What follows is the calculated isotope pattern for the NdCl3 unit with the most intense ion set to 100%.

Formula: Nd1Cl3

mass  %
247  54.4 ___________________________
248 24.4 ____________
249 100.0 __________________________________________________
250 40.1 ____________________
251 97.0 ________________________________________________
252 23.5 ____________
253 61.1 _______________________________
254 5.9 ___
255 34.6 _________________
256 0.5
257 15.5 ________
258 0.0
259 3.9 __
260 0.0
261 0.4


The data on these compounds pages are assembled and adapted from the primary literature and several other sources including the following.

  • R.T. Sanderson in Chemical Periodicity, Reinhold, New York, USA, 1960.
  • N.N. Greenwood and A. Earnshaw in Chemistry of the Elements, 2nd edition, Butterworth, UK, 1997.
  • F.A. Cotton, G. Wilkinson, C.A. Murillo, and M. Bochmann, in Advanced Inorganic Chemistry, John Wiley & Sons, 1999.
  • A.F. Trotman-Dickenson, (ed.) in Comprehensive Inorganic Chemistry, Pergamon, Oxford, UK, 1973.
  • R.W.G. Wyckoff, in Crystal Structures, volume 1, Interscience, John Wiley & Sons, 1963.
  • A.R.West in Basic solid state chemistry Chemistry, John Wiley & Sons, 1999.
  • A.F. Wells in Structural inorganic chemistry, 4th edition, Oxford, UK, 1975.
  • J.D.H. Donnay, (ed.) in Crystal data determinative tables, ACA monograph number 5, American Crystallographic Association, USA, 1963.
  • D.R. Lide, (ed.) in Chemical Rubber Company handbook of chemistry and physics, CRC Press, Boca Raton, Florida, USA, 77th edition, 1996.
  • J.W. Mellor in A comprehensive treatise on inorganic and theoretical chemistry, volumes 1-16, Longmans, London, UK, 1922-1937.
  • J.E. Macintyre (ed.) in Dictionary of inorganic compounds, volumes 1-3, Chapman & Hall, London, UK, 1992.

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