Octahedral versus tetrahedral coordination of Al in synthetic micas determined by XANES
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 2/3 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. 39 refs., 4 figs., 1 tab.
- Authors:
-
- Universita di Roma Tre (Italy)
- Centre de Recherche sur la Synthese et la Chimie des Mineraux, Orleans (France); and others
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 543157
- Resource Type:
- Journal Article
- Journal Name:
- American Mineralogist
- Additional Journal Information:
- Journal Volume: 82; Journal Issue: 5-6; Other Information: PBD: May-Jun 1997
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 40 CHEMISTRY; 58 GEOSCIENCES; MICA; STRUCTURAL CHEMICAL ANALYSIS; CRYSTAL STRUCTURE; ALUMINIUM; MINERALOGY
Citation Formats
Mottana, A, Ventura, G D, and Robert, J L. Octahedral versus tetrahedral coordination of Al in synthetic micas determined by XANES. United States: N. p., 1997.
Web. doi:10.2138/am-1997-5-608.
Mottana, A, Ventura, G D, & Robert, J L. Octahedral versus tetrahedral coordination of Al in synthetic micas determined by XANES. United States. https://doi.org/10.2138/am-1997-5-608
Mottana, A, Ventura, G D, and Robert, J L. 1997.
"Octahedral versus tetrahedral coordination of Al in synthetic micas determined by XANES". United States. https://doi.org/10.2138/am-1997-5-608.
@article{osti_543157,
title = {Octahedral versus tetrahedral coordination of Al in synthetic micas determined by XANES},
author = {Mottana, A and Ventura, G D and Robert, J L},
abstractNote = {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 2/3 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. 39 refs., 4 figs., 1 tab.},
doi = {10.2138/am-1997-5-608},
url = {https://www.osti.gov/biblio/543157},
journal = {American Mineralogist},
number = 5-6,
volume = 82,
place = {United States},
year = {Thu May 01 00:00:00 EDT 1997},
month = {Thu May 01 00:00:00 EDT 1997}
}