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Phase transition phenomena in an iron phosphateglass and thermal stability criteria

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7th African Conference on Non Destructive Testing ACNDT 2016 & the 5th International Conference on NDT and Materials Industry and Alloys (IC-WNDT-MI)

2016

Phase transition phenomena in an iron

phosphateglass and thermal stability criteria

A.Djeridi, A. Benmounah, N. Kamel, D. Moudir, S.Kamariz, Y.Mouheb

Abstract : The thermal stability of an iron phosphate glassdedicated to radioactive waste confinement is a crucialcharacteristic for the integrity of the waste package. In this study,we investigate the thermal stability criteria defined by Hruby,Weinberg and Lu/Liu by measuring the glass transitiontemperature (Tg), the crystallization temperature (T), and themelting temperature (T) of an iron phosphate glass loaded withradioactive waste. These temperatures decrease when loading theglass with the waste: Tg decreases from 623.48 °C to 580.04 °C,Tcmfrom 766.34 to 679.26 °C and Tfrom 932.76 °C to 919.75 °C.Thermal stability criteria show satisfactory values, in the interval0.14 0.69.

Keywords : Iron phosphate glass, Thermal stability, Radioactive waste, XRD, DTA, SEM

Centre de Recherche en Technologies Industrielles - CRTI - www.crti.dz

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