Abstract
Mutual separation characteristics have been investigated for the neighbouring rare earth elements Nd, Sm, Eu and Gd from binary oxide mixtures Nd 2O 3–Sm 2O 3, Sm 2O 3–Eu 2O 3 and Eu 2O 3–Gd 2O 3 using a stepwise chlorination–chemical vapour transport reaction mediated by vapour complexes LnAl n Cl 3 n+3 within 6 h. The separation factor, expressed as atomic ratio for the resulting chlorides, was 6.84 for Nd:Sm, 4.84 for Sm:Eu and 26.5 for Gd:Eu, respectively. As a comparison, the conventional CVT process resulted in the separation factor values of 1.64 for Nd:Sm, 3.19 for Sm:Eu, 1.78 for Gd:Eu and 3.99 for Eu:Gd.
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