A Raman and infrared spectroscopic study of the sulphate mineral aluminite Al-2(SO4)(OH)(4)center dot 7H(2)O

作者：Frost Ray L^*; Lopez Andres; Scholz Ricardo; Wang Lina

来源：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , 2015, 148: 232-236.

DOI：10.1016/j.saa.2015.04.011

• Aluminite
• Sulphate
• Hydroxyls
• Water of hydration
• Raman spectroscopy
• Infrared spectroscopy

The mineral aluminite has been studied using a number of techniques, including scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDX) and Raman and infrared spectroscopy. Raman spectroscopy identifies multiple sulphate symmetric stretching modes in line with the three sulphate crystallographically different sites. Raman spectroscopy also identifies a low intensity band at 1069 cm(-1) which may be attributed to a carbonate symmetric stretching mode, indicating the presence of thaumasite. The observation of multiple bands in this v4 (spectral) region offers evidence for the reduction in symmetry of the sulphate anion from T-d to C-2v or even lower symmetry. The Raman band at 3588 cm(-1) is assigned to the OH unit stretching vibration and the broad feature at around 3439 cm(-1) to water stretching bands. Water stretching vibrations are observed at 3157, 3294, 3378 and 3439 cm(-1). Vibrational spectroscopy enables an assessment of the molecular structure of aluminite to be made.

• 出版日期2015-9-5