Abstract
Nitric acid waste can be immobilized in an amorphous aluminosilicate matrix that is produced by polymerization of metal alkoxides [1]. Unlike vitreous aluminosilicate host matrices obtained by melting, neither alkalies, alkaline earths, nor borates are required since no melting is involved. Instead, the alkoxide glass formers and radionuclides react directly to form a randomly cross-linked structure of silica and alumina polyhedra. Structurally, the amorphous product formed through chemical polymerization is similar to a true glass except that it has not experienced melting. As a result, neither a glass transition temperature nor a specific volume temperature dependence would be expected in such an amorphous material. As a chemically durable waste form, the "gel-glass" product should be substantially better than ordinary waste glass because it can be made without the addition of either alkalies or boron.
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