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 K1.8Na1.2[(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.
Highlights
Our findings indicated that the two predominating factors influencing the formation of K1.8 Na1.2 [(UO2 )BSi4 O12 ]
Hydrothermal synthesis methods were employed for the preparation of the first example of a uranyl borosilicate phase, K1.8 Na1.2 [(UO2 )BSi4 O12 ]
The framework structure is made up of UO6 octahedra connected by [BSi4 O12 ]5- borosilicate chains containing BO4 and SiO4 tetrahedra, which constitutes a new borosilicate fundamental building block (FBB). This highlights the structural diversity that is accessible in this new class of compounds, warranting further exploration of crystalline uranyl borosilicate compounds
Summary
The glasses are durable and can host a wide range of elements in the disordered structures, which are composed of network forming
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