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GEOREF RECORD

Effects of the stacking faults on the calculated electron density of mica polytypes; the Durovic effect

Massimo Nespolo and Giovanni Ferraris
Effects of the stacking faults on the calculated electron density of mica polytypes; the Durovic effect (in Mica 2000, Annibale Mottana (prefacer) and Paolo Francesco Sassi (prefacer))
European Journal of Mineralogy (December 2001) 13 (6): 1035-1045

Abstract

The occurrence of residues in the Fourier map of OD structures (polytypes in which pairs of building modules are geometrically equivalent) in the positions of the "virtual atoms" of the corresponding family structure derives from the presence of stacking faults inside an otherwise ordered (periodic) matrix. These residues are commonly spurious peaks deriving from the refinement of the structure with a single scale factor for both the family and the non-family reflections, which may be instead on a different scale because of the different peak shape and background characterizing the two types of reflections, resulting in broadening and streaking of the non-family reflections. The "virtual atoms" occur in the same positions of the atoms corresponding to the stacking faults, but the spurious peaks are in a quantitative relation with them only if the stacking faults diffract coherently. The case of mica polytypes is illustrated also with the aid of examples taken from the literature.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 13
Serial Issue: 6
Title: Effects of the stacking faults on the calculated electron density of mica polytypes; the Durovic effect
Title: Mica 2000
Author(s): Nespolo, MassimoFerraris, Giovanni
Author(s): Mottana, Annibaleprefacer
Author(s): Sassi, Paolo Francescoprefacer
Affiliation: Japan Science and Technology Corporation, National Institute of Research in Inorganic Materials, Ibaraki, Japan
Pages: 1035-1045
Published: 200112
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
Meeting name: Advances on micas; problems, methods, applications in geodynamics
Meeting location: Rome, ITA, Italy
Meeting date: 20001102Nov. 2-3, 2000
References: 47
Accession Number: 2002-012286
Categories: Mineralogy of silicates
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: University of Torino, ITA, Italy
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200205
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