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Investigation of Titanium in Metamict Nb-Ta-Ti Oxides Using the Extended X-Ray Absorption Fine Structure Technique

Published online by Cambridge University Press:  15 February 2011

R. B. Greegor ,
F. W. Lytle ,
R. C. Ewing  and
R. F. Haaker
R. B. Greegor
Affiliation:
The Boeing Company, Seattle, Washington 98124
F. W. Lytle
Affiliation:
The Boeing Company, Seattle, Washington 98124
R. C. Ewing
Affiliation:
Department of Geology, University of New Mexico, Albuquerque, NM 87131
R. F. Haaker
Affiliation:
Department of Geology, University of New Mexico, Albuquerque, NM 87131
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Extract

Recent proposals have suggested that radioactive wastes can be isolated 1 as dilute solid solutions in a crystalline, titanate assemblage. One titanate assemblage, SYNROC, consists of zirconolite (CaZrTi207), perovskite (CaTiO3) and "hollandite" (BaAl2Ti6016) with additional accessory phases. There are two major problems in the evaluation of the long term stability of any crystalline wasteform such as SYNROC: 1) it is difficult to assess the long term stability of materials from short term laboratory experiments that are not necessarily valid simulations of complex geochemical processes, and 2)the corresponding titanate minerals are uncommon, making it difficult to study long term alteration and radiation effects on a significant number of specimens from different localities and geologic environments. There has even been considerable controversy concerning the stability of the reasonably common and simple phase, perovskite (CaTiO3)

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 11: Symposium – Scientific Basis for Nuclear Waste Management V , 1981 , 409
Copyright
Copyright © Materials Research Society 1982

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References

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