Effect of compositional variations on charge compensation of AlO{sub 4} and BO{sub 4} entities and on crystallization tendency of a rare-earth-rich aluminoborosilicate glass
- Laboratoire de Chimie de la Matiere Condensee de Paris (UMR CNRS 7574), Ecole Nationale Superieure de Chimie de Paris (ENSCP, ParisTech), 11 rue Pierre et Marie Curie, Paris 75231 (France)
- CEA, IRAMIS, Service Interdisciplinaire sur les Systemes Moleculaires et Materiaux, CEA Saclay, Gif-sur-Yvette 91191 (France)
- Laboratoire d'Etudes et Developpement de Matrices de Conditionnement, DEN/DTCD/SCDV, CEA Marcoule, Bagnols-sur-Ceze 30207 (France)
This paper presents the structural and crystallization study of a rare-earth-rich aluminoborosilicate glass that is a simplified version of a new nuclear glass proven to be a potential candidate for the immobilization of highly concentrated radioactive wastes that will be produced in the future. In this work, we studied the impact of changing the nature of alkali (Li{sup +}, Na{sup +}, K{sup +}, Rb{sup +}, Cs{sup +}) or alkaline-earth (Mg{sup 2+}, Ca{sup 2+}, Sr{sup 2+}, Ba{sup 2+}) cations present in glass composition on glass structure (by {sup 27}Al and {sup 11}B nuclear magnetic resonance spectroscopy) and on its crystallization tendency during melt cooling at 1 K/min (average cooling rate during industrial process). From these composition changes, it was established that alkali cations were preferentially involved in charge compensation of (AlO{sub 4}){sup -} and (BO{sub 4}){sup -} entities in the glassy network comparatively to alkaline-earth cations. Whatever the nature of alkali cations, glass compositions containing calcium gave way to the crystallization of an apatite silicate phase bearing calcium and rare-earth (RE) cations (Ca{sub 2}RE{sub 8}(SiO{sub 4}){sub 6}O{sub 2}, RE = Nd or La) but melt crystallization tendency during cooling strongly varied with the nature of alkaline-earth cations.
- OSTI ID:
- 22029854
- Journal Information:
- Materials Research Bulletin, Vol. 44, Issue 9; Other Information: Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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