Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Studies on Coprecipited Phases in the Calcium-Gadolinium Oxalate System
Hsiu ChiKozo Nagashima
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1968 Volume 41 Issue 9 Pages 2054-2058

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Abstract

Calcium oxalate is often used as a carrier for precipitating rare earth elements. Gadolinium was chosen as a rare earth element and X-ray powder diffractometry used for the identification of coprecipitated solids. The X-ray lattice spacings are tabulated for each of the coprecipitates of varying composition in the calcium-gadolinium oxalate system. From the spacings, the following facts were obtained: (1) The uptake mechanisms of gadolinium in calcium oxalate, and calcium in gadolinium oxalate are completely due to the formation of solid solutions. (2) Several new solid solution phases were formed. (3) When the gadolinium to calcium ratio is proper, precipitates having a weddellite structure, which is not obtained in usual analytical procedures, are formed.

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