1968 Volume 41 Issue 9 Pages 2054-2058
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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