Abstract
The crystal structure of a novel variety {[(Mg0.81Fe0.19)(H2O)6](H2O)4}{(UO2)[(P0.67As0.33)O4]}2 of the mineral saleeite is determined using X-ray diffraction (Bruker Smart diffractometer, λMoKα, graphite monochromator, 2θmax = 56.62°, 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, β = 90.806(4)°, space group P121/n1, Z = 2, and ρcalcd = 3.34 g/cm3. 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.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
