Crystal Growth and Structure Characterization of Three Layered Uranyl Phosphates and Their Relation to the Phosphuranylite Family
Journal Article
·
· Crystal Growth and Design
- Department of Chemistry and Biochemistry, and the Center for Hierarchical Waste Form Materials, University of South Carolina, Columbia, South Carolina 29208, United States
Three new materials related to the phosphuranylite family were synthesized by using alkali chloride fluxes at 875 °C: CsNa3[(UO2)3O2(PO4)2] (1), Cs2Na4[(UO2)5O5(PO4)2] (2), and Rb6[(UO2)5O5(PO4)2] (3). CsNa3[(UO2)3O2(PO4)2] (1) crystallizes in the triclinic space group P1- with the lattice parameters, a = 6.9809(3) Å, b = 9.3326(4) Å, c = 12.9626(5) Å, α = 71.5620(10)°, β = 78.9430(10)°, and γ = 68.0840(1)°; Cs2Na4[(UO2)5O5(PO4)2] (2) crystallizes in the triclinic space group P1- with the lattice parameters, a = 6.9890(3) Å, b = 12.9652(6) Å, c = 13.2086(6) Å, α = 96.224(2)°, β = 101.433(2)°, and γ = 105.459(2)°; and Rb6(PO4)2[(UO2)5O5] crystallizes in the P21/m space group with the lattice parameters, a = 6.9255(3) Å, b = 24.773(1) Å, c = 7.07647(3) Å, and β = 90.741(1)°. The sheets of 1 are based on the phosphuranylite topology, while the sheets of 2 and 3 contain sheets based on the U3O8 and uranophane topologies but differ in the orientation of the phosphate tetrahedra. The regions between the sheets contain the alkali cations and are not all identical in structures 1 and 2. The geometrical isomers found in these sheet structures and their relationship to known sheet topologies are discussed.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Center for Hierarchical Waste Form Materials (CHWM); Univ. of South Carolina, Columbia, SC (United States)
- Sponsoring Organization:
- USDOE SC Office of Basic Energy Sciences (SC-22)
- DOE Contract Number:
- SC0016574
- OSTI ID:
- 1566487
- Journal Information:
- Crystal Growth and Design, Journal Name: Crystal Growth and Design Journal Issue: 2 Vol. 19; ISSN 1528-7483
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
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