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Phase equilibria and prospects of crystal growth in the system LiF–GdF 3 –LuF 3

2008; Wiley; Volume: 43; Issue: 11 Linguagem: Inglês

10.1002/crat.200800354

1521-4079

I.A. dos Santos, I.M. Ranieri, Detlef Klimm, R. Fornari, S.L. Baldochi,

Molten salt chemistry and electrochemical processes

Abstract Scheelite type LiGdF 4 , LiLuF 4 , and mixtures of both end members were prepared by a hydrofluorination route from the rare earth oxides and commercial LiF. The samples were purified by melting in HF/Ar mixtures, and were investigated by differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and energy dispersive X‐ray spectroscopy (EDX) techniques. Both end members show unlimited miscibility in the solid phase. Mixed crystals containing at least 65 mol‐% LiLuF 4 melt under direct formation of the liquid phase. The gap between solidus and liquidus is narrow. LiGdF 4 and mixed crystals with less then 65 mol‐% LiLuF 4 decompose peritectically under formation of (Gd,Lu)F 3 . Crystal growth is expected to be possible either from Lu‐rich melts with the appropriate scheelite composition or from Gd‐rich melts containing an excess of LiF. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)