Thermochemistry of rare-earth trifluorides I. Fluorine bomb calorimetric determination of the enthalpies of formation of LaF3, PrF3, NdF3, GdF3, DyF3, HoF3, and ErF3☆☆☆

Add time:09/27/2019    Source:sciencedirect.com

The energies of combustion of high-purity samples of lanthanum, praseodymium, neodymium, gadolinium, dysprosium, holmium, and erbium in fluorine to form the respective trifluorides were measured in a bomb calorimeter. The results obtained for the standard enthalpies of formation, ΔHfo(298.15 K)/kJ mol−1, are as follows: LaF3, −(1699.5 ± 2.0); PrF3, −(1689.1 ± 2.6); NdF3, −(1679.4 ± 1.9); GdF3, −(1699.3 ± 2.3); DyF3, −(1692.0 ± 1.9); HoF3, −(1697.8 ± 2.3); and ErF3, −(1693.6 ± 1.9).

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