Emanation thermal analysis study of brannerite ceramics for immobilization of hazardous waste |
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| Authors: | V. Balek Y. Zhang V. Zelenák J. Ŝubrt I. N. Beckman |
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| Affiliation: | (1) Nuclear Research Institute Řež, plc, 25068 Řež, Czech Republic;(2) Materials and Engineering Science, Australian Nuclear Science and Technology Organization, PM Box 1, Menai, 2234, Australia;(3) Institute of Inorganic Chemistry, ASCR, 25068 Řež, Czech Republic;(4) Chemical Faculty, Moscow State University, 119899 Moscow, GSP-3, Russia |
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| Abstract: | Brannerite based ceramics, designed as a matrix for immobilization of high level radioactive waste (HLW), was investigated from the viewpoint of microstructure changes and atomic transport properties caused by leaching of the ceramics at pH 2 and 11, respectively. Scanning electron microscopy (SEM) and emanation thermal analysis (ETA) techniques were used for this purpose. Surface morphology, microstructure changes and transport properties of both ‘as-leached’ and ‘as-prepared’ samples were compared and the effect of leaching on the thermal behavior of the ceramics samples heated in the temperature range from 20 to 1250°C was characterized. The mobility of radon in the brannerite ceramics was evaluated by mathematical modeling from ETA results. The thermal behavior of the non-leached brannerite ceramics sample and its natural analogue brannerite mineral was compared using the ETA. On leave from the Institute of Chemical Sciences, Faculty of Sciences, P. J. Ŝafárik University, 041 54 Koŝice, Slovak Republic |
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| Keywords: | brannerite ceramics emanation thermal analysis leaching radon SEM |
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