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Chemical Composition, Geochemical Alteration, and Radiation Damage Effects in Natural Perovskite

Published online by Cambridge University Press:  10 February 2011

Gregory R. Lumpkin ,
Michael Colella ,
Katherine L. Smith ,
Roger H. Mitchell  and
Alf Olav Larsen
Gregory R. Lumpkin
Affiliation:
Australian Nuclear Science and Technology Organisation, PMB 1, Menai, NSW 2234, Australia
Michael Colella
Affiliation:
Australian Nuclear Science and Technology Organisation, PMB 1, Menai, NSW 2234, Australia
Katherine L. Smith
Affiliation:
Australian Nuclear Science and Technology Organisation, PMB 1, Menai, NSW 2234, Australia
Roger H. Mitchell
Affiliation:
Dept. of Geology, Lakehead Univ., 955 Oliver Road, Thunder Bay, Ontario, Canada, P7B 5E]
Alf Olav Larsen
Affiliation:
Norsk Hydro a.s., Research Centre Porsgrunn, N-3901 Porsgrunn, Norway
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Abstract

Preliminary analytical and transmission electron microscopy (AEM and TEM) results for a small suite of natural perovskites are reported in this paper and discussed in relation to previous work. We show that perovskite compositions in Synroc and tailored ceramics plot within the known fields of natural perovskite compositions. AEM analyses and electron diffraction work on selected samples indicate that they are predominantly stoichiometric variants of the cubic perovskite structure. Geochemical alteration was observed in one sample of loparite from Bratthagen, Norway. The primary result of this alteration was leaching of Na from the A-site. Although sufficient alpha-decay dose levels for complete amorphization are not realized in this suite of samples, the available data bracket the beginning of the crystalline-amorphous transformation at doses that are ∼ 2-4 times greater than those of zirconolite of similar age. These results may be due to fundamental differences in the damage annealing rates of perovskite and zirconolite.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 506: Symposium – Scientific Basis for Nuclear Waste Management XXI , 1997 , 207
Copyright
Copyright © Materials Research Society 1998

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References

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