In:
Clay Minerals, Mineralogical Society, Vol. 37, No. 4 ( 2002-12), p. 617-628
Abstract:
Analysis of the near-infrared (NIR) spectral bands of phyllosilicates, together with the mid-infrared bands, enables testing and confirmation of band assignments for the structural OH vibrations. Spectral analyses of selected smectites and serpentine-kaolin minerals are presented here. The results of this study indicate that dioctahedral smectites may contain both in-plane and out-of-plane OH-bending vibrations, as suggested by Farmer (1974). In-plane bands occur near 800 915 cm –1 , while the weaker out-of-plane vibrations occur near 600 700 cm –1 and are enhanced in dioctahedral smectites when the structure is disrupted by substitutions. Analysis of the OH-stretching vibrations and their NIR overtone bands is also presented for both smectites and serpentine-kaolin minerals. These overtones are more straightforward for serpentines than for kaolinite, and a strong overtone associated with the kaolinite OH-stretching band at 3620 cm –1 is found that supports its assignment as an OH-stretching band.
Type of Medium:
Online Resource
ISSN:
0009-8558
,
1471-8030
DOI:
10.1180/0009855023740064
Language:
English
Publisher:
Mineralogical Society
Publication Date:
2002
detail.hit.zdb_id:
2036186-5
detail.hit.zdb_id:
961059-5
SSG:
13
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