The Enthalpies of Sublimation of Neodymium Trichloride
in the Form of Monomeric and Dimeric Molecules

L. S. Kudin and A. A. Smirnov

Ivanovo State University of Chemical Sciences and Technology, Ivanovo, Russia

E-mail: kudin@isuct.ru

Abstract—The vaporization of neodymium trichloride was studied by high-temperature mass spectrometry in
the temperature range 872–1147 K. Saturated vapor over neodymium trichloride largely consisted of mono-
meric and a small amount (1–1.5%) of dimeric molecules. The partial vapor component pressures were deter-
mined and the enthalpies of sublimation _sH(298.15 ) in the form of monomeric and dimeric molecules were
calculated by the second and third laws of thermodynamics. This gave 317 5 and 440 20 kJ/mol for NdCl₃
and Nd₂Cl₆, respectively.

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