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Octahedral versus tetrahedral coordination of Al in synthetic micas determined by XANES

Annibale Mottana, Jean-Louis Robert, Augusto Marcelli, Gabriele Giuli, Giancarlo Della Ventura, Eleonora Paris and Wu Ziyu
Octahedral versus tetrahedral coordination of Al in synthetic micas determined by XANES
American Mineralogist (June 1997) 82 (5-6): 497-502

Abstract

We used the JUMBO monochromator at SSRL to measure the Al K-edge X-ray absorption spectra of synthetic micas having variable Al content and occupancy, from 0 to 2/3 in the octahedral M positions, and 0 to 2/4 in the tetrahedral T positions. The measured Al K edges differ markedly, but the differences may have a common explanation: (1) Micas containing 1/3 Al in M or 1/4 Al in T have K edges that differ in the energy and intensity of the first two features, which are related to interaction of Al with its first-shell nearest neighbors (O and OH or F). They are nearly identical to the K edges of reference minerals such as albite (tetrahedral Al only) or grossular (octahedral Al only). (2) Micas containing Al in both M and T have K edges that can be interpreted as a weighed combination of the simple edges.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 82
Serial Issue: 5-6
Title: Octahedral versus tetrahedral coordination of Al in synthetic micas determined by XANES
Affiliation: Universita di Roma Tre, Dipartimento di Scienze Geologiche, Rome, Italy
Pages: 497-502
Published: 199706
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 39
Accession Number: 1997-055741
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Secondary Affiliation: CNRS, FRA, FranceIstituto Nazionale di Fisica Nucleare, ITA, ItalyUniversita di Firenze, ITA, ItalyUniversita di Camerino, ITA, ItalyInstitut des Materiaux de Nantes, FRA, France
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 199718
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