Mutual separation characteristics of lanthanoid chlorides LnCl3 (Ln = Pr, Nd) using a chemical vapor transporting method via gaseous complexes were investigated. Compared with AlCl3 as the transporting agent, alkaline chlorides can transport more amounts of LnCl3, and enhance the separation efficiency between PrCl3 and NdCl3.
Mutual separations between mixed lanthanoid chlorides, LnCl3 (Ln = Pr and Nd), were performed using a chemical-vapor transporting method via gaseous complexes with a series of alkaline metal chlorides (ACl). The resulting separation factor depended slightly on the alkaline metals, indicating a tendency for the factor to increase with the atomic number; good separation characteristics were observed for gaseous complexes with KCl and RbCl. For complexes in ternary systems, LnCl3–ACl–AlCl3, the codeposition of ACl with LnCl3, which took place in the binary system, LnCl3–ACl, was depressed and LnCl3 was obtained in a form free from the used complex formers.
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