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Phase equilibria and prospects of crystal growth in the system LiF–GdF3–LuF3

✍ Scribed by I. A. dos Santos; I. M. Ranieri; D. Klimm; R. Fornari; S. L. Baldochi

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
235 KB
Volume
43
Category
Article
ISSN
0232-1300

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✦ Synopsis

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. Dedicated to Prof. Ladislav Bohatý on the occasion of his 60 th birthday

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