Abstract
Mutual separations of rare earth chlorides in the PrEr, PrSm and PrNd binary systems and the PrGdEr ternary system were performed using chemical vapour transportation of vapour complexes LnAl n Cl 3+3 n , (Ln, rare earths). Heavier rare earth chlorides were more readily transported and concentrated in the deposits in lower temperature zones while lighter ones were selectively deposited in higher temperature zones. Good separation characteristics (efficiency and purity) were observed for the resulting LnCl 3 deposits by optimization of temperature gradients for the selective deposition of LnCl 3 and by repeating the transport reaction. The separation factors, expressed as atomic ratios for the resulting chlorides, Pr:Er and Pr:Sm, were equal to 10.8 and 2.3 respectively.
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