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Glasses for nuclear waste immobilization. Effect of Lutetium addition on YAS glass crystallization kinetics.

[+] Author and Article Information
Diana Carolina Lago

Departamento Materiales Nucleares, Centro Atómico Bariloche, Comisión Nacional de Energía Atómica; Av. Ezequiel Bustillo Km. 9,5. Código Postal 8400, San Carlos de Bariloche, Río Negro, Argentina; Instituto Balseiro (Universidad Nacional de Cuyo, Comisión Nacional de Energía Atómica); Av. Ezequiel Bustillo Km. 9,5. Código Postal 8400, San Carlos de Bariloche, Río Negro, Argentina
dlago@cab.cnea.gov.ar

Maria Belén Bortot

DiPaola Laboratory. Department of Bioengineering, University of Colorado − Anschutz Medical Campus, Aurora, Colorado 80045, USA
maria.bortot@ucdenver.edu

Miguel Oscar Prado

Departamento Materiales Nucleares, Centro Atómico Bariloche, Comisión Nacional de Energía Atómica; Av. Ezequiel Bustillo Km. 9,5. Código Postal 8400, San Carlos de Bariloche, Río Negro, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas; Av. Rivadavia 1917, (C1033AAJ) Ciudad Autónoma de Buenos Aires, Buenos Aires, Argentina; Instituto Balseiro (Universidad Nacional de Cuyo, Comisión Nacional de Energía Atómica); Av. Ezequiel Bustillo Km. 9,5. Código Postal 8400, San Carlos de Bariloche, Río Negro, Argentina
pradom@cab.cnea.gov.ar

1Corresponding author.

ASME doi:10.1115/1.4042497 History: Received June 29, 2018; Revised December 21, 2018

Abstract

Glasses have emerged as an alternative material that can be used for long-term treatment and management of radioactive waste material. Specifically, glass can be used as a matrix to immobilize radioactive material. Within the glass industry, silicate glasses are the most widely used due to their properties. Alkaline free silicate glasses are particularly corrosion resistant. Due to the latter, rare earth aluminosilicate glasses are good candidates for actinides immobilization, especially yttrium aluminosilicate (YAS) glasses. The crystallization kinetics of YAS glasses on heating has already been studied and this work is focused on the effect of lutetium addition on the yttrium aluminosilicate glass crystallization kinetics. The presence of a small amount of Lutetium in an yttrium aluminosilicate glass decreases the surface density of nucleation sites by about one order of magnitude and significantly decreases the crystal growth rate. In this work, it was observed that Lutetium additions in the order of 0.2 (% wt) to a YAS glass dramatically decreased the surface density of nucleation sites, for example at 1000 ºC from 1011 to 109 nuclei·m-2. Additionally, crystal growth rates for yttrium disilicate, decreased from (8.21 ± 0.28) µm·h-1 to (0.54 ± 0.04) µm·h-1 at the same temperature.

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