Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1402648 | Journal of Molecular Structure | 2014 | 8 Pages |
Abstract
The mineral coquimbite has been analysed using a range of techniques including SEM with EDX, thermal analytical techniques and Raman and infrared spectroscopy. The mineral originated from the Javier Ortega mine, Lucanas Province, Peru. The chemical formula was determined as (Fe1.373+,Al0.63)â2.00(SO4)3·9H2O. Thermal analysis showed a total mass loss of â¼73.4% on heating to 1000 °C. A mass loss of 30.43% at 641.4 °C is attributed to the loss of SO3. Observed Raman and infrared bands were assigned to the stretching and bending vibrations of sulphate tetrahedra, aluminium oxide/hydroxide octahedra, water molecules and hydroxyl ions. The Raman spectrum shows well resolved bands at 2994, 3176, 3327, 3422 and 3580 cmâ1 attributed to water stretching vibrations. Vibrational spectroscopy combined with thermal analysis provides insight into the structure of coquimbite.
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Authors
Ray L. Frost, Željka ŽigoveÄki Gobac, Andrés López, Yunfei Xi, Ricardo Scholz, Cristiano Lana, Rosa Malena Fernandes Lima,