Effect of Molybdenum on the Structure and on the Crystallization of SiO2-Na2O-CaO-B2O3 Glasses

Crystallization of the poorly durable Na2MoO4 phase able to incorporate radioactive cesium must be avoided in SiO2–Al2O3–B2O3–Na2O–CaO glasses developed for the immobilization of Mo‐rich nuclear wastes. Increasing amounts of B2O3 and MoO3 were added to a SiO2–Na2O–CaO glass, and crystallization tend...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the American Ceramic Society 2007-03, Vol.90 (3), p.774-783
Main Authors: Caurant, Daniel, Majérus, Odile, Fadel, Edward, Lenoir, Marion, Gervais, Christel, Pinet, Olivier
Format: Article
Language:English
Subjects:
Chemical Sciences
Crystallization
Effects
Glass
Inorganic chemistry
Molybdenum
Radioactive wastes
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Crystallization of the poorly durable Na2MoO4 phase able to incorporate radioactive cesium must be avoided in SiO2–Al2O3–B2O3–Na2O–CaO glasses developed for the immobilization of Mo‐rich nuclear wastes. Increasing amounts of B2O3 and MoO3 were added to a SiO2–Na2O–CaO glass, and crystallization tendency was studied. Na2MoO4 crystallization tendency decreased with the increase of B2O3 concentration whereas the tendency of CaMoO4 to crystallize increased due to preferential charge compensation of BO4− entities by Na+ ions. 29Si MAS NMR showed that molybdenum acts as a reticulating agent in glass structure. Trivalent actinides surrogate (Nd3+) were shown to enter into CaMoO4 crystals formed in glasses.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2006.01467.x