Crystal structure of the (Mg,Fe)[UO{sub 2}(P,As)O{sub 4}]{sub 2} . 10H{sub 2}O solid solution-A novel mineral variety of saleeite
- University of Chicago (United States)
- Universidade de Sao Paulo (Brazil)
- Russian Academy of Sciences, Institute of Problems of Chemical Physics (Russian Federation)
The crystal structure of a novel variety {l_brace}[(Mg{sub 0.81}Fe{sub 0.19})(H{sub 2}O){sub 6}](H{sub 2}O){sub 4}{r_brace}{l_brace}(UO{sub 2})[(P{sub 0.67}As{sub 0.33})O{sub 4}]{r_brace}{sub 2} of the mineral saleeite is determined using X-ray diffraction (Bruker Smart diffractometer, {lambda}MoK{sub {alpha}}, graphite monochromator, 2{theta}{sub max} = 56.62{sup o}, R = 0.0321 for 2317 reflections, T = 100 K). The main crystal data are as follows: a = 6.952(6) A, b = 19.865(5) A, c = 6.969(2) A, {beta} = 90.806(4){sup o}, space group P12{sub 1}/n1, Z = 2, and {rho}{sub calcd} = 3.34 g/cm{sup 3}. It is shown that the structure is formed by alternating (along the [010] direction) anionic layers, which are composed of uranium bipyramids and T(P,As) tetrahedra, and cation layers consisting of M(Mg,Fe) octahedra and water molecules, which are joined through a system of asymmetric hydrogen bonds. The hydrogen atoms are located, the scheme of hydrogen bonds is established, and their geometric characteristics are calculated.
- OSTI ID:
- 22050938
- Journal Information:
- Crystallography Reports, Vol. 53, Issue 5; Other Information: Copyright (c) 2008 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7745
- Country of Publication:
- United States
- Language:
- English
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