Thullium(III) fluoride is an inorganic compound with the chemical formula TmF3.
Production It can be produced by reacting thulium(III) sulfide and hydrofluoric acid, followed by thermal decomposition:
3 Tm2S3 + 20 HF + (2 + 2x)H2O → 2 (H3O)Tm3F10·xH2O↓ + 9 H2S↑ (x=1.7) (H3O)Tm3F10 → 3 TmF3 + HF↑ + H2O↑
Thulium(III) oxide reacts with fluorinating agents such as hydrogen fluoride,Georg Brauer (Hrsg.), unter Mitarbeit von Marianne Baudler u. a.: Handbuch der Präparativen Anorganischen Chemie. 3., umgearbeitete Auflage. Band I, Ferdinand Enke, Stuttgart 1975, , S. 254. nitrogen trifluoride xenon difluorideBrekhovskikh, M. N.; Popov, A. I.; Kiselev, Yu. M.; Fedorov, V. A.; Sobolev, B. P. Interaction of xenon difluoride with rare earth element, zirconium, and hafnium oxides. Vysokochistye Veshchestva, 1987. 5: 83-86. . to create thullium(III) fluoride as well, although the reaction with nitrogen trifluoride is incomplete and produces a mixture of TmOF and TmF3.
References
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