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- W2081938317 abstract "Raman spectroscopy complimented with infrared spectroscopy has been used to determine the molecular structure of the roselite arsenate minerals of the roselite and fairfieldite subgroups of formula Ca2B(AsO4)2·2H2O (where B may be Co, Fe2+, Mg, Mn, Ni and Zn). The Raman arsenate (AsO4)2− stretching region shows strong differences between the roselite arsenate minerals which is attributed to the cation substitution for calcium in the structure. In the infrared spectra complexity exists with multiple (AsO4)2− antisymmetric stretching vibrations observed, indicating a reduction of the tetrahedral symmetry. This loss of degeneracy is also reflected in the bending modes. Strong Raman bands around 450 cm−1 are assigned to ν4 bending modes. Multiple bands in the 300–350 cm−1 region assigned to ν2 bending modes provide evidence of symmetry reduction of the arsenate anion. Three broad bands for roselite are found at 3450, 3208 and 3042 cm−1 and are assigned to OH stretching bands. By using a Libowitzky empirical equation hydrogen bond distances of 2.75 and 2.67 Å are estimated. Vibrational spectra enable the molecular structure of the roselite minerals to be determined and whilst similarities exist in the spectral patterns, sufficient differences exist to be able to determine the identification of the minerals." @default.
- W2081938317 created "2016-06-24" @default.
- W2081938317 creator A5006496281 @default.
- W2081938317 date "2009-01-01" @default.
- W2081938317 modified "2023-10-02" @default.
- W2081938317 title "Raman and infrared spectroscopy of arsenates of the roselite and fairfieldite mineral subgroups" @default.
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- W2081938317 doi "https://doi.org/10.1016/j.saa.2008.06.039" @default.
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