Sublimation enthalpies of gadolinium and thulium triiodides and formation enthalpies of the molecules LnI3, Ln2I6, and Ln3I9 (Ln = Gd, Tm)

Motalov, V.B.; Dunaev, A.M.; Tsybert, A.O.; Kudin, L.S.; Butman, M.F.; Krämer, Karl (2017). Sublimation enthalpies of gadolinium and thulium triiodides and formation enthalpies of the molecules LnI3, Ln2I6, and Ln3I9 (Ln = Gd, Tm). International journal of mass spectrometry, 417, pp. 29-33. Elsevier 10.1016/j.ijms.2017.04.007

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The sublimation of solid gadolinium and thulium triiodides was studied by Knudsen effusion mass spectrometry.
The partial vapor pressures [atm] of the monomer and dimer molecules were determined as: lnp(GdI3)
= −(32.31 ± 0.18) ×103/T +(21.38 ± 0.21) for 777–946 K; lnp(Gd2I6) = −(38.07 ± 0.42) ×103/
T +(24.49 ± 0.47) for 843–946 K; lnp(TmI3) = −(31.84 ± 0.25) ×103/T +(21.88 ± 0.29) for
760–965 K; and lnp(Tm2I6) =−(38.23 ± 0.27) ×103/T +(25.71 ± 0.43) for 799–965 K. In addition, the
trimers Gd3I9 and Tm3I9 were detected in very small fractions. On the basis of a joint analysis of all available data
in literature, the sublimation enthalpies [kJ mol−1] at 298.15 K are recommended as 283 ± 9 (GdI3),
336 ± 16 (Gd2I6), 366 ± 50 (Gd3I9), 276 ± 3 (TmI3), 330 ± 6 (Tm2I6), and 354 ± 50 (Tm3I9). The
standard formation enthalpies [kJ mol−1] of the gaseous species at 298.15 K are −341 ± 9 (GdI3),
−912 ± 16 (Gd2I6), −1506 ± 50 (Gd3I9), −344 ± 5 (TmI3), −909 ± 7 (Tm2I6), and −1506 ± 50
(Tm3I9).

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