Hydrothermal Synthesis and Structural Investigation of a Crystalline Uranyl Borosilicate

Pace, Kristen A.; Klepov, Vladislav V.; Smith, Mark D.; Williams, Travis; Morrison, Gregory; Lauterbach, Jochen A.; Misture, Scott T.; zur Loye, Hans-Conrad

doi:10.3390/inorganics9040025

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Hydrothermal Synthesis and Structural Investigation of a Crystalline Uranyl Borosilicate

^1,2,†

^2,‡,

²,

^1,2,

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and

Hans-Conrad zur Loye

^1,2,*

Center for Hierarchical Waste form Materials, Columbia, SC 29208, USA

Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208, USA

Department of Chemical Engineering, University of South Carolina, Columbia, SC 29208, USA

⁴

Kazuo Inamori School of Engineering, Alfred University, Alfred, NY 14802, USA

Author to whom correspondence should be addressed.

^†

Present Address: Pit Technologies Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

^‡

Present Address: Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.

Academic Editor: Duncan H. Gregory

Inorganics 2021, 9(4), 25; https://doi.org/10.3390/inorganics9040025

Received: 5 March 2021 / Revised: 28 March 2021 / Accepted: 29 March 2021 / Published: 6 April 2021

(This article belongs to the Special Issue Cornerstones in Contemporary Inorganic Chemistry)

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Abstract

The relevance of multidimensional and porous crystalline materials to nuclear waste remediation and storage applications has motivated exploratory research focused on materials discovery of compounds, such as actinide mixed-oxoanion phases, which exhibit rich structural chemistry. The novel phase K_1.8Na_1.2[(UO₂)BSi₄O₁₂] has been synthesized using hydrothermal methods, representing the first example of a uranyl borosilicate. The three-dimensional structure crystallizes in the orthorhombic space group Cmce with lattice parameters a = 15.5471(19) Å, b = 14.3403(17) Å, c = 11.7315(15) Å, and V = 2615.5(6) Å³, and is composed of UO₆ octahedra linked by [BSi₄O₁₂]⁵⁻ chains to form a [(UO₂)BSi₄O₁₂]³⁻ framework. The synthesis method, structure, results of Raman, IR, and X-ray absorption spectroscopy, and thermal stability are discussed. View Full-Text

Keywords: crystalline borosilicate; actinides; supercritical hydrothermal synthesis; waste forms

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MDPI and ACS Style

Pace, K.A.; Klepov, V.V.; Smith, M.D.; Williams, T.; Morrison, G.; Lauterbach, J.A.; Misture, S.T.; zur Loye, H.-C. Hydrothermal Synthesis and Structural Investigation of a Crystalline Uranyl Borosilicate. Inorganics 2021, 9, 25. https://doi.org/10.3390/inorganics9040025

AMA Style

Pace KA, Klepov VV, Smith MD, Williams T, Morrison G, Lauterbach JA, Misture ST, zur Loye H-C. Hydrothermal Synthesis and Structural Investigation of a Crystalline Uranyl Borosilicate. Inorganics. 2021; 9(4):25. https://doi.org/10.3390/inorganics9040025

Chicago/Turabian Style

Pace, Kristen A., Vladislav V. Klepov, Mark D. Smith, Travis Williams, Gregory Morrison, Jochen A. Lauterbach, Scott T. Misture, and Hans-Conrad zur Loye. 2021. "Hydrothermal Synthesis and Structural Investigation of a Crystalline Uranyl Borosilicate" Inorganics 9, no. 4: 25. https://doi.org/10.3390/inorganics9040025

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Hydrothermal Synthesis and Structural Investigation of a Crystalline Uranyl Borosilicate

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