Home > Publications database > On the complex H-bonding network in paravauxite, Fe$^{2}$+Al$_{2}$(PO$_{4}$)$_{2}$(OH)$_{2}$·8H$_{2}$O: A single-crystal neutron diffraction study > print

001     186695
005     20240529111728.0
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245 _ _ |a On the complex H-bonding network in paravauxite, Fe$^{2}$+Al$_{2}$(PO$_{4}$)$_{2}$(OH)$_{2}$·8H$_{2}$O: A single-crystal neutron diffraction study
260 _ _ |a Twickenham
|b Mineralogical Society of Great Britain and Ireland
|c 2014
336 7 _ |a Journal Article
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520 _ _ |a The crystal structure and the chemical composition of a paravauxite from the Siglo Veinte Mine, Llallagua, Bustillo Province, Potosi Department, Bolivia [Fe(Formula Formula Mg0.064Ca0.002)Σ0.998Al(1)Al(2)Al2.005P(P1.998Si0.002)Σ2O8(OH)2·8H2O, a = 5.242(1) Å, b = 10.569(2) Å, c = 6.970(2) Å, α = 106.78(3)°, β = 110.81(2)° and γ = 72.29(2)°, space group P1İ], was investigated by single-crystal neutron diffraction and electron microprobe analysis in wavelength-dispersive mode. Neutron-intensity data were collected at 293 K and anisotropic structure refinement was performed. At the end of the refinement no peak larger than 1.3 fm/ Å3 was present in the final difference-Fourier map of the nuclear density. The final statistical index was R1 = 0.0495 for 194 refined parameters and 1678 unique reflections with Fo > 4σ(Fo). Eleven independent H sites (i.e. H(1), H(2), H(3), H(4A), H(4B), H(5), H(6), H(7), H(8), H(9A) and H(9B)), all at ~1 Å from the respective O sites, were located successfully. H(4A) and H(4B) and H(9A) and H(9B) are two mutually exclusive subsite couples only 0.4–0.6 Å apart. The complex H-bonding scheme in the paravauxite structure is now well defined and 12 independent H bonds, with an energetically favourable bonding configuration, are described. A comparison between the previous experimental findings based on Raman and infrared spectroscopy and those obtained in this present study is carried out. Paravauxite provides the rare opportunity to investigate the H-bond configuration of coexisting hydroxyl groups and H2O molecules in minerals by single-crystal neutron diffraction. H2O is present as zeolitic (i.e. lying in the cavities) and non-zeolitic H2O (i.e. bonded to Al or Fe to form Al or Fe octahedra).
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