Abstract

Co-precipitations of cerium (III) and neodymium (III) at 10wt.% in LiCl–CaCl2 (30-70mol%) molten salt at 705°C have been achieved using an original way of precipitation, wet argon sparging. Several CeCl3/NdCl3 ratios have been studied, and the isolated powders were analyzed using different characterization methods including XRD investigations. The lanthanides precipitation yields have been determined around 99.9% using ICP-AES analysis. XRD demonstrated that the precipitates mainly contained mixed oxychloride (Ce1−xNdx)OCl and a small amount of the mixed oxide Ce1−yNdyO2−0.5y. Calcination of these precipitates has resulted in the cerium and neodymium mixed oxides. For the precipitation with a Ce/Nd=50/50 ratio, an hydroxychloride Ln(OH)2Cl and the oxychloride CeIV(Nd0.7Ce0.3)IIIO3Cl have been identified as unexpected intermediate compounds.

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