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- W2561197812 abstract "Abstract A crystal-chemical investigation of vauxite, ideally FeAl 2 (PO 4 ) 2 (OH) 2 ·6H 2 O, from Llallagua (Bolivia) has been performed using a multi-methodological approach based on WDS-electron microprobe, single-crystal X-ray diffraction, and vibrational spectroscopies (Raman and FTIR). The structure was refined in the triclinic P space group, with the following unit-cell constants: a 9.1276(2), b 11.5836(3), c 6.15960(10) A, α 98.3152(10)°, β 92.0139(10)°, γ 108.1695(9)°, and V 610.05(2) A 3 . The vauxite structure is based on a building unit oriented parallel to the c axis and composed of a chain of Fe2 and Al2 edge-sharing octahedra and two chains of corner-sharing P2 tetrahedra and Al1 octahedra, interconnected via corners and P1 tetrahedra. Neighboring building units are interconnected by Al3 octahedra and via Fe1 octahedra. The framework is completed with two non-coordinated water molecules. The latter, together with the two hydroxyl groups and the other four coordinated water molecules, form a complex hydrogen bonding network whose interactions further compact the whole framework. Both FTIR and Raman spectra show, in the H 2 O stretching region, a broad absorption consisting of several overlapping components due to the six water molecules plus the OH groups. The band multiplicity observed in the low-wavenumber region ( −1 ) is compatible with the presence of two distorted PO 4 tetrahedra." @default.
- W2561197812 created "2017-01-06" @default.
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- W2561197812 date "2016-01-01" @default.
- W2561197812 modified "2023-09-27" @default.
- W2561197812 title "Structure Refinement and Vibrational Spectroscopy of Vauxite From the Type Locality, Llallagua (Bolivia)" @default.
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- W2561197812 doi "https://doi.org/10.3749/canmin.1500060" @default.
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