Near-infrared spectroscopy of natural alunites

Frost, Ray L.; Wain, Daria L.

doi:10.1016/j.saa.2007.11.029

Cited by 8 publications

(1 citation statement)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…OH vibrations for jarosite were reported at 3260, 3355, 3430 and 512,790 cm À1 attributed to the stretching and bending of the OH units. Raman spectra of these minerals have also been published [8][9][10][11]. These results serve to show the positions of the bands which may be assigned to sulphate and phosphate.…”

Section: Vibrational Spectroscopymentioning

confidence: 92%

Vibrational spectroscopic characterization of the sulphate mineral khademite Al(SO4)F⋅5(H2O)

Frost

Scholz

López

et al. 2013

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

Self Cite

View full text Add to dashboard Cite

Vibrational spectroscopy has been used to characterize the sulphate mineral khademite Al(SO4)F·5(H2O). Raman band at 991 cm-1 with a shoulder at 975 cm-1 is assigned to the ν1 (SO4)2- symmetric stretching mode. The observation of two symmetric stretching modes suggests that the sulphate units are not equivalent. Two low intensity Raman bands at 1104 and 1132 cm-1 are assigned to the ν3 (SO4)2- antisymmetric stretching mode. The broad Raman band at 618 cm-1 is assigned to the ν4 (SO4)2- bending modes. Raman bands at 455, 505 and 534 cm-1 are attributable to the doubly degenerate ν2 (SO4)2- bending modes. Raman bands at 2991, 3146 and 3380 cm-1 are assigned to the OH stretching bands of water. Five infrared bands are noted at 2458, 2896, 3203, 3348 and 3489 cm-1 are also due to water stretching bands. The observation of multiple water stretching vibrations gives credence to the non-equivalence of water units in the khademite structure. Vibrational spectroscopy enables an assessment of the structure of khademite.

show abstract

Section: Vibrational Spectroscopymentioning

confidence: 92%