Flux crystal growth, structure, magnetic and optical properties of a family of alkali uranium(IV) phosphates

Usman, Mohammad; Morrison, Gregory; Klepov, Vladislav V.; Smith, Mark D.; zur Loye, Hans-Conrad

doi:10.1016/j.jssc.2018.10.033

Title: Flux crystal growth, structure, magnetic and optical properties of a family of alkali uranium(IV) phosphates

Journal Article · Fri Oct 26 00:00:00 EDT 2018 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2018.10.033· OSTI ID:1605404

Usman, Mohammad ^[1]; Morrison, Gregory ^[1]; Klepov, Vladislav V. ^[1]; Smith, Mark D. ^[1]; zur Loye, Hans-Conrad ^[1]

Univ. of South Carolina, Columbia, SC (United States). Dept. of Chemistry and Biochemistry

A family of alkali uranium(IV) phosphates, AU₂(PO₄)₃ (A = Li – Cs), was synthesized as single crystals by the reaction of US₂ and (NH₄)₂HPO₄ in the respective ACl (A = Li – Cs) flux contained in a sealed fused-silica tube at 850 °C, and as phase pure powders from a similar reaction using UF₄ as the uranium source. AU₂(PO₄)₃ (A = Li – Rb) crystallize in the NaTh₂(PO₄)₃ (NTP) structure type with monoclinic space group C2/c and consist of a 3D structure that features a framework composed of edge- and corner-sharing polyhedra. The cesium analogue, CsU₂(PO₄)₃, crystallizes in a different structure with space group P2₁/n that is related to the NaZr₂(PO₄)₃ (NZP) structure type and consists of a framework composed of corner-sharing polyhedra. Two new alkali uranium phosphates, Li₂U(PO₄)₂ and Cs₄U₄(P₂O₇)₅, were also grown as single crystals at 700 °C. Li₂U(PO₄)₂ was isolated in approximately 30% yield based on uranium. Li₂U(PO₄)₂ crystallizes in space group P2₁/c exhibiting a layered structure while Cs₄U₄(P₂O₇)₅, crystallizes in space group P2₁/n in a new structure type featuring a 3D framework. Finally, the magnetic susceptibilities and the field dependent magnetizations were measured for AU₂(PO₄)₃ (A = Li, Na, K and Cs); all compounds exhibited negative Weiss temperatures with no obvious antiferromagnetic transition. Optical properties were measured by UV–vis and IR spectroscopy.

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Research Organization:: Univ. of South Carolina, Columbia, SC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0018739

OSTI ID:: 1605404

Journal Information:: Journal of Solid State Chemistry, Vol. 270, Issue C; ISSN 0022-4596

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Uranium phosphates
Flux growth synthesis
Magnetic susceptibility
Optical properties

CSD 1866113: Experimental Crystal Structure Determination Usman, Mohammad; Morrison, Gregory; Klepov, Vladislav V. https://doi.org/10.25505/fiz.icsd.cc20mv6q The current record is supplemented by this dataset	dataset	January 2019
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CSD 1896164: Experimental Crystal Structure Determination Usman, Mohammad; Morrison, Gregory; Klepov, Vladislav V. https://doi.org/10.25505/fiz.icsd.cc21n3lf The current record is supplemented by this dataset	dataset	January 2019
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Title: Flux crystal growth, structure, magnetic and optical properties of a family of alkali uranium(IV) phosphates

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