THE INFLUENCE OF STRUCTURAL FE, AL AND MG ON THE INFRARED OH BANDS IN SPECTRA OF DIOTAHEDRAL SMECTITES
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dc.contributor.author | Bishop J. | |
dc.contributor.author | Madejová J. | |
dc.contributor.author | Komadel P. | |
dc.contributor.author | Fröschl H. | |
dc.date.accessioned | 2021-09-24T09:06:31Z | |
dc.date.available | 2021-09-24T09:06:31Z | |
dc.date.issued | 2002 | |
dc.identifier | https://elibrary.ru/item.asp?id=13803191 | |
dc.identifier.citation | Clay Minerals, 2002, 37, 4, 607-616 | |
dc.identifier.issn | 0009-8558 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/30550 | |
dc.description.abstract | Visible to near-infrared (NIR) reflectance spectra and mid-IR transmittance spectra are presented here for a collection of dioctahedral smectites. Analysis of the structural OH vibrations is performed by comparing the NIR combination and overtone bands with fundamental stretching and bending absorption features in the mid-IR region. Second derivatives are used to determine the actual band centres, which are often shifted slightly by a spectral continuum in the reflectance or transmittance spectra. New bands have been identified near 4170 and 4000 cm-1 in the NIR spectra of nontronite with tetrahedral substitution. A related band is observed near 4100 cm-1 for montmorillonites with substantial tetrahedral and/or octahedral substitution. These bands are correlated with the mid-IR bands near 680 cm-1 for nontronite and near 630 cm-1 for montmorillonite. Comparison of the OH overtone and combination bands with the fundamental stretching and bending vibrations gives consistent results. | |
dc.subject | infrared spectroscopy | |
dc.subject | smectites | |
dc.subject | structural OH | |
dc.subject | montmorillonite | |
dc.subject | nontronite | |
dc.title | THE INFLUENCE OF STRUCTURAL FE, AL AND MG ON THE INFRARED OH BANDS IN SPECTRA OF DIOTAHEDRAL SMECTITES | |
dc.type | Статья |
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