Ruthenium solubility and its impact on the crystallization behavior and electrical conductivity of MoO3-containing borosilicate-based model high-level nuclear waste glasses

Kamat, Hrishikesh; Arias-Serrano, Blanca I.; Yaremchenko, Aleksey; Goel, Ashutosh

doi:10.1016/j.jnoncrysol.2020.120356

Title: Ruthenium solubility and its impact on the crystallization behavior and electrical conductivity of MoO₃-containing borosilicate-based model high-level nuclear waste glasses

Journal Article · Fri Aug 14 00:00:00 EDT 2020 · Journal of Non-Crystalline Solids

DOI:https://doi.org/10.1016/j.jnoncrysol.2020.120356· OSTI ID:1749859

^[1]; Arias-Serrano, Blanca I. ^[2];

^[2];

^[1]

Rutgers, The State Univ. of New Jersey, Piscataway, NJ (United States)
Univ. of Aveiro (Portugal)

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. Here, 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.

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Research Organization:: Rutgers Univ., New Brunswick, NJ (United States)

Sponsoring Organization:: USDOE Office of Environmental Management (EM); USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP)

Grant/Contract Number:: NE0008597; NE0008431

OSTI ID:: 1749859

Alternate ID(s):: OSTI ID: 1647508

Journal Information:: Journal of Non-Crystalline Solids, Vol. 549; ISSN 0022-3093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Glass
Nuclear waste
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Title: Ruthenium solubility and its impact on the crystallization behavior and electrical conductivity of MoO3-containing borosilicate-based model high-level nuclear waste glasses

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Title: Ruthenium solubility and its impact on the crystallization behavior and electrical conductivity of MoO₃-containing borosilicate-based model high-level nuclear waste glasses