Hydrothermal Synthesis and Structural Investigation of a Crystalline Uranyl Borosilicate

Inorganics

Gregory Morrison¹  KristenA. Pace¹  Hans-Conrad zur Loye¹  ScottT. Misture¹  Travis Williams²  JochenA. Lauterbach²  VladislavV. Klepov³  MarkD. Smith³ 

[1] Center for Hierarchical Waste form Materials, Columbia, SC 29208, USA;Department of Chemical Engineering, University of South Carolina, Columbia, SC 29208, USA;Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208, USA;

关键词: crystalline borosilicate;    actinides;    supercritical hydrothermal synthesis;    waste forms;   

DOI  :  10.3390/inorganics9040025

来源: DOAJ

【 摘 要 】

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) ų, 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.

【 授权许可】

Unknown