VAPORIZATION REACTIONS IN THE THULIUM - FLUORINE SYSTEM.

Article abstract of DOI:10.1016/0022-5088(76)90203-4

The vaporization and sublimation reactions for the thulium - fluorine system were investigated by mass-loss, X-ray powder diffraction and elemental analysis techniques. Thulium trifluoride was reduced only partially by elemental thulium; a reduced stoichiometric fluoride could not be isolated. Partially reduced TmF//3 decomposes upon heating to a metal-rich vapor and a trifluoride-enriched residue. By a target collection Knudsen effusion method, equilibrium vapor pressures were determined for the reaction TmF//3 (s,l) equals TmF//3 (g). The derived thermodynamic values are compared with those of other lanthanide fluoride systems.