2 research outputs found
Local structural analyses on molten terbium fluoride in lithium fluoride and lithiumâcalcium fluoride mixtures
X-ray absorption fine structure (XAFS) measurements on terbium fluoride in molten lithium fluoride and in molten
lithiumâcalcium fluoride mixtures, (e.g. 0.20TbF3â0.80LiF, 0.20TbF3â0.62LiFâ0.18CaF2, 0.20TbF3â0.48LiFâ0.32CaF2, 0.50TbF3â0.50LiF, and 0.50TbF3â0.38LiFâ0.12CaF2), 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 0.20TbF3â0.80LiF, 0.20TbF3â0.62LiFâ0.18CaF2 and 0.50TbF3â0.50LiF mixtures, Ni's decrease from ca. 8 to 6 and ri's also decrease from ca. 2.29 to 2.26 Ă
on melting. On the other hands, in molten 0.20TbF3â0.48LiFâ0.32CaF2 and 0.50TbF3â0.38LiFâ0.12CaF2 mixtures, Ni's are slightly larger than 6 and ri's do not change. These facts correspond to the amount of Fâ supplied by solvent melts, i.e. the effect of CaF2 becomes predominant at bCaF2 > 0.32 in ternary 0.20TbF3âaLiFâbCaF2 mixtures and at bCaF2 > 0.12 in ternary 0.50TbF3âaLiFâbCaF2 mixtures