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A comparative XRD and TEM study of the physical meaning of the white mica "crystallinity" index

Fernando Nieto and Antonio Sanchez-Navas
A comparative XRD and TEM study of the physical meaning of the white mica "crystallinity" index
European Journal of Mineralogy (October 1994) 6 (5): 611-621

Abstract

The white mica crystallinity index has been analysed as a function of various parameters: 1) the domain size; 2) lattice distortion, and 3) the presence of other phyllosilicates overlapping the 10 Aa peak, particularly I/S mixed-layer minerals. The lattice distortion (2) is determined by the Wilson method and subtracted from the experimental XRD profile. The remanent peak width is compared with the statistical values from direct measurements of (1) on HRTEM images. The relation between 10 and 5 Aa peak widths was used to evaluate (3). The progressive decrease of the illite crystallinity index is a consequence of a parallel improvement in both quantity of defects and crystallite size. According to the experimental relationship, the Kubler anchizone limits are equivalent to 900 and 300 Aa in terms of crystallite size.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 6
Serial Issue: 5
Title: A comparative XRD and TEM study of the physical meaning of the white mica "crystallinity" index
Affiliation: Universidad de Granada, Dpto. de Mineralogia y Petrologia, Granada, Spain
Pages: 611-621
Published: 199410
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 33
Accession Number: 1994-054179
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199424
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