Preparation of homogeneous (Th0.8U0.2)O-2 powders by mechanical blending of Th(C2O4)(2)center dot 6H(2)O and U(C2O4)(2)center dot 6H(2)O powders

摘要

Thorium oxalate and uranium (IV) oxalate powders were prepared and characterized by chemical, TGA/DTG, IR and X-ray diffraction analysis. Th(C2O4)(2). 6H(2)O and U(C2O4)(2). 6H(2)O powders (80% Th and 20% U) were mechanically mixed in a diagonal rotating drum for 3 h. Mechanically mixed oxalates were decomposed at 623 K, calcined at 1173 K for 24 h in air and reduced for 2 h at 923 K in hydrogen atmosphere, The powders were compacted into pellets and sintered in flowing CO2 at 1373 K for 1 h. The XRD pattern of (Th0.8U0.2)O-2 obtained showed that a complete solid solution was formed. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 7]