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Emanation Thermal Analysis Study of Brannerite

Published online by Cambridge University Press:  21 March 2011

V. Balek ,
V. Zelenák ,
Z. Málek ,
E. R. Vance  and
J. Subrt
V. Balek
Affiliation:
Nuclear Research Institute CZ- 25068 Rez, Czech Republic
V. Zelenák
Affiliation:
Nuclear Research Institute CZ- 25068 Rez, Czech Republic On leave from the Faculty of Sciences, University of Kozice, Moyzesova 11, SK-04154 Kozice, Slovak Republic
Z. Málek
Affiliation:
Nuclear Research Institute CZ- 25068 Rez, Czech Republic
E. R. Vance
Affiliation:
Australian Nuclear Science and Technology Organization, Private Mailbag 1, Menai (Sydney), NSW 2234, Australia
J. Subrt
Affiliation:
Institute of Inorganic chemistry, Academy of Sciences of the Czech Republic, CZ-25068, Rez, Czech Republic
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Abstract

Radon emanation thermal analysis (ETA) during ”step by step”heating to selected temperatures up to 1200oC in argon and subsequent cooling yielded detailed information on the annealing of radiation damage and macroscopic defects in a natural brannerite. Thermogravimetry showed mass losses in the temperature ranges 230-315, 570-760 and 840-1040oC. Mass spectrometry of the evolvedgases indicated M/Z = 44, i.e. CO2. Crystallization of initially amorphous brannerite was indicated by ETA in the temperature range 900-1020oC, in agreement with the X-ray diffraction results. From the radon diffusion activation energy values determined in ETA, the degree of structural ordering was assessed at different temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 663: Symposium – Scientific Basis for Nuclear Waste management XXIV , 2000 , 347
Copyright
Copyright © Materials Research Society 2001

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References

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