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Ion-Induced Amorphization of Murataite

Published online by Cambridge University Press:  21 March 2011

Jie Lian ,
Sergey V. Yudintsev ,
Sergey V. Stefanovsky ,
Olga I. Kirjanova  and
Rodney C. Ewing
Jie Lian
Affiliation:
Department of Nuclear Engineering & Radiological Sciences, University of Michigan, Ann Arbor, MI 48109, USA
Sergey V. Yudintsev
Affiliation:
Institute of Geology of Ore Deposits RAS, Staromonetnii per. 35, Moscow 109017, Russa
Sergey V. Stefanovsky
Affiliation:
SIA Radon, 7th Rostovskii per. 2/14, Moscow 119121, Russia
Olga I. Kirjanova
Affiliation:
SIA Radon, 7th Rostovskii per. 2/14, Moscow 119121, Russia
Rodney C. Ewing
Affiliation:
Department of Nuclear Engineering & Radiological Sciences, University of Michigan, Ann Arbor, MI 48109, USA
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Abstract

Murataite A4B2C7O22-x, where A = Na+, Ca2+, REE3+, An3+/4+; B = Mn2+/3+, Zn2+; C = Ti4+, Fe3+, Al3+; 0≤x≤1, is an isometric, derivative of the fluorite-structure. Murataite is potentially suitable as a phase for the immobilization of rare earth (REE) and actinide elements (An). Murataite structures with three-(3C), five-(5C), and eight-fold (8C) multiples of the fluorite unit cell parameters have been identified. Radiation-induced amorphization of murataite has been investigated by 1 MeV Kr+ ion irradiation of three ceramic samples produced by melting in a resistive furnace and a cold crucible at 1400-1600 °C. The 1 MeV Kr+ ion irradiations were performed at room temperature using IVEM-Tandem Facility at Argonne National Laboratory. Radiation damage was observed by in-situ TEM. Initially, the irradiation caused disordering of the murataite structure. Murataite was rendered fully amorphous at a dose of (1.7∼1.9)Á1018 ion/m2. The pyrochlore structure phase (2C) is more radiation resistant to ion irradiation-induced amorphization than the murataite structure. Combining results on murataite with those pyrochlore and fluorite, a generally increasing trend in the susceptibility to ion beam damage is found in the fluorite-related structures as a function of the increasing multiples of the fluorite unit cells.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 713: Symposium JJ – Scientific Basis for Nuclear Waste Management XXV , 2002 , JJ3.2
Copyright
Copyright © Materials Research Society 2002

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