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Formation Rate and Compositions of the Actinide Hosts with Garnet Structure

Published online by Cambridge University Press:  17 March 2011

Tatiana S. Ioudintseva  and
Soo-Chun Chae
Tatiana S. Ioudintseva
Affiliation:
IGEM RAS, Staromonetny 35, Moscow 109017, RUSSIA
Soo-Chun Chae
Affiliation:
KIGAM, 30 Kajung-Dong, Yusung-Ku, Taejon, KOREA
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Abstract

Garnet phases have been considered as a durable crystalline waste form for hosting actinide. The garnet-structure phases with stoichiometries of Ca2,5Ce0,5Zr2Fe3O12, Ca2CeZrFeFe3O12, and Ca1,5GdCe0,5ZrFeFe3O12 were synthesized through cold pressing and sintering in air and oxygen to determine the optimum parameters for the formation of actinide waste forms. Cerium (Ce) was used as an imitator of plutonium due to its similarity in oxidation state and ionic radii. Gadolinium (Gd) plays a major role as an absorber of neutrons that prevents nuclear chain reaction. It also serves as imitators of the trivalent actinides. Ce-garnet or (Ce,Gd)-garnet is chemically analogous to the garnets with plutonium and/or trivalent actinides. The results of XRD and SEM-EDS examination of the products of experiments reveal that equilibrium state was reached at the temperatures of 1300 °C and 1200 °C for 1 and 5 hours heating, respectively.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 824: Symposium CC – Scientific Basis for Nuclear Waste Management XXVIII , 2004 , CC8.12
Copyright
Copyright © Materials Research Society 2004

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