March 3, 2026Crystal Growth & Design1 citations

Mild Hydrothermal Synthesis, Crystal Structure, and Spectroscopic Analysis of a Highly Luminescent Uranyl Sulfate, K(UO 2 )SO 4 F

GPGopabandhu PanigrahiUniversity of South Carolina LMLakshani W. MasachchiUniversity of South Carolina MSMark D. SmithUniversity of South Carolina

Key Points

Strong luminescence is noted in the compound, indicating its potential for optoelectronic applications.
Lattice parameters of K(UO2)SO4F are reported as a = 8.72140 Å, b = 10.9204 Å, c = 13.2249 Å, with a unit cell volume of 1259.56 Å3.
The analysis utilized mild hydrothermal synthesis to create single crystals and polycrystalline forms of the compound.
Highlights the unique bicapped trigonal prismatic UO5F2 structure, with implications for material science and photonics.

Abstract

A new layered uranyl sulfate fluoride compound, K(UO2)SO4F, was successfully synthesized as both single-crystals and polycrystalline powder under mild hydrothermal conditions. The compound K(UO2)SO4F crystallizes in the orthorhombic crystal system with the space group Pbca, exhibiting lattice parameters of a = 8.72140(10) Å, b = 10.9204(2) Å, and c = 13.2249(2) Å, with unit cell volume V = 1259.56(3) Å3 and Z = 8. The K(UO2)SO4F compound contains bicapped trigonal prismatic UO5F2 polyhedra that are connected to sulfate tetrahedra via vertex sharing to form two-dimensional 2∞(UO)2SO4F− sheets that are separated by K+ ions. The photoluminescence emission spectrum of K(UO2)SO4F is collected by using a confocal 375 nm diode laser and is presented. The TGA and IR data for this compound are discussed.

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