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Local structural analyses on molten terbium fluoride in lithium fluoride and lithium–calcium fluoride mixtures

Numakura, Masahiko and Okamoto, Yoshihiro and Yaita, Tsuyoshi and Shiwaku, Hideaki and Akatsuka, Hiroshi and Nezu, Atsushi and Tajima, Keisuke and Shimohara, Yasuaki and Bessada, Catherine and Pauvert, Olivier and Zanghi, Didier and Chamelot, Pierre and Matsuura, Haruaki Local structural analyses on molten terbium fluoride in lithium fluoride and lithium–calcium fluoride mixtures. (2010) Journal of Fluorine Chemistry, vol. 131 (n° 10). pp. 1039-1043. ISSN 0022-1139

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Official URL: http://dx.doi.org/10.1016/J.JFLUCHEM.2010.07.011

Abstract

X-ray absorption fine structure (XAFS) measurements on terbium fluoride in molten lithium fluoride and in molten lithium–calcium fluoride mixtures, (e.g. 0.20TbF3–0.80LiF, 0.20TbF3–0.62LiF–0.18CaF2, 0.20TbF3–0.48LiF–0.32CaF2, 0.50TbF3–0.50LiF, and 0.50TbF3–0.38LiF–0.12CaF2), have been carried out. In the solid state, coordination number of terbium (Ni) and inter ionic distances between terbium and fluorine in the first neighbor (ri) are nearly constant in all mixtures. In 0.20TbF3–0.80LiF, 0.20TbF3–0.62LiF–0.18CaF2 and 0.50TbF3–0.50LiF mixtures, Ni's decrease from ca. 8 to 6 and ri's also decrease from ca. 2.29 to 2.26 Å on melting. On the other hands, in molten 0.20TbF3–0.48LiF–0.32CaF2 and 0.50TbF3–0.38LiF–0.12CaF2 mixtures, Ni's are slightly larger than 6 and ri's do not change. These facts correspond to the amount of F− supplied by solvent melts, i.e. the effect of CaF2 becomes predominant at bCaF2 > 0.32 in ternary 0.20TbF3–aLiF–bCaF2 mixtures and at bCaF2 > 0.12 in ternary 0.50TbF3–aLiF–bCaF2 mixtures.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at : http://www.sciencedirect.com/science/article/pii/S0022113910002058
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Japan Atomic Energy Agency - JAEA (JAPAN)
Other partners > LE STUDIUM (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Tokyo Institute of Technology - Tokyo Tech (JAPAN)
Other partners > Université d'Orléans (FRANCE)
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Deposited By: Audrey LEFEVRE
Deposited On:14 Jan 2013 13:45

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