"The fast and facile conversion of europium acetate via microwave radiation with and in different tetrafluoroborate ionic liquids to oxygen-free, hexagonal EuF3 nanoparticles"
Article Europium(III) Fluoride Nanoparticles from Ionic Liquids: Str...
reading how it is easily made in this paper by precipitation, I think using a classic HFaq or NH4F aqueous solution with chlorides or nitrates could be sufficient ?
Article Formation of complexes on the surface of nanosized europium fluoride
Can be difficult directly from oxides though, without a proper temperature and strong fluorination agent.
Thank you, I need anhydrous material .( i.e. I manufacture simple hydrate salts, so the chemistry is pretty easy) . I was looking for a cheap available ionic solvent(s)