Effect of calcination temperature on neptunium dioxide microstructure and dissolution

Peruski, Kathryn M.; Powell, Brian A.

doi:10.1039/d0en00689k

Title: Effect of calcination temperature on neptunium dioxide microstructure and dissolution

Journal Article · Mon Oct 19 00:00:00 EDT 2020 · Environmental Science: Nano

DOI:https://doi.org/10.1039/d0en00689k· OSTI ID:1756008

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Clemson Univ., Anderson, SC (United States)
Clemson Univ., Anderson, SC (United States); Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)

Comprehensive thermodynamic understanding of nuclear materials is paramount for long-term management of legacy nuclear waste and commercial spent nuclear fuel. Actinide oxides (AnO₂(s)) are ubiquitous materials throughout the nuclear fuel cycle, yet existing thermodynamic data has noticeable discrepancies, creating uncertainty in environmental prediction of the fate of nuclear materials. The microstructure of actinide oxides, particularly neptunium (Np) and plutonium (Pu), is rarely investigated using high resolution electron microscopy, but such features may illuminate why differences in solubility measurements persist. The aim of this study was to synthesize NpO₂(s) at varying calcination temperatures, characterize the materials using high resolution electron microscopy, and perform batch solubility studies to measure total dissolved Np as a function of calcination temperature. Here, the current work demonstrates the sizable differences in dissolution of NpO₂(s) based on process conditions, such as the temperature at which the material is calcined and resultant particle size, and the need for more thorough evaluation of the microstructure of solid phases used to generate thermodynamic data of actinides.

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Research Organization:: Clemson Univ., SC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: SC0012530; SC00012530

OSTI ID:: 1756008

Alternate ID(s):: OSTI ID: 1737655

Journal Information:: Environmental Science: Nano, Vol. 7, Issue 12; Related Information: https://doi.org/10.1039/D0EN00689K; ISSN 2051-8153

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Neptunium dioxide
solubility
particle size
actinides

Title: Effect of calcination temperature on neptunium dioxide microstructure and dissolution

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References (43)

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