Ruthenium solubility and its impact on the crystallization behavior and electrical conductivity of MoO3-containing borosilicate-based model high-level nuclear waste glasses
authors Kamat, H; Arias-Serrano, BI; Yaremchenko, A; Goel, A
nationality International
journal JOURNAL OF NON-CRYSTALLINE SOLIDS
author keywords Glass; Nuclear waste; Ruthenium; Crystallization; Electrical conductivity
keywords PLATINUM-GROUP-METALS; MOO3; RUO2; VITRIFICATION; MOLYBDENUM; TRANSPORT; STATES; ND2O3; OXIDE
abstract The present study focuses on investigating the solubility of RuO2 in a borosilicate-based model high-level waste glass and understanding its impact on the crystallization behavior and electrical conductivity of the resulting vitrified waste forms. The solubility limit of RuO2 in the investigated glass composition has been determined to be 460 ppm by weight. The higher concentration of RuO2 results in sub-micron sized Ru-rich inclusions in the glassy matrix, which eventually agglomerate to form needle-like and polyhedral RuO2 crystals. It is observed that RuO2 selectively promotes the crystallization of the rare-earth apatite phase over the powellite phase. The as-synthesized RuO2-containing glasses exhibit semiconducting behavior with a similar level of electrical conductivity below the glass transition. The percolation of non-uniformly distributed RuO2 inclusions may result in a formation of short-range low-resistive conduction pathways in the host glass matrix leading to an apparent metallic-like behavior of selected thin samples with the highest ruthenium content.
publisher ELSEVIER
issn 0022-3093
isbn 1873-4812
year published 2020
volume 549
digital object identifier (doi) 10.1016/j.jnoncrysol.2020.120356
web of science category Materials Science, Ceramics; Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000581972400012
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journal analysis (jcr 2019):
journal impact factor 2.929
5 year journal impact factor 2.653
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