Quick
Search: 		  
advanced search
 GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help 
American Mineralogist Signup for GSW Email News
JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
American Mineralogist; November 2006; v. 91; no. 11-12; p. 1922-1926; DOI: 10.2138/am.2006.2365
© 2006 Mineralogical Society of America
This Article
Right arrow Figures Only
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in Web of Science
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Web of Science (7)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Xue, X.
Right arrow Articles by Kanzaki, M.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

Depolymerization effect of water in aluminosilicate glasses: Direct evidence from 1H-27Al heteronuclear correlation NMR

Xianyu Xue* and Masami Kanzaki

Institute for Study of the Earth’s Interior, Okayama University, Misasa, Tottori 682-0193 Japan

Correspondence: * E-mail: xianyu{at}misasa.okayama-u.ac.jp

We have applied one-dimensional (1D) 1H MAS NMR, 27Al -> 1H CP MAS NMR, as well as 2D 27Al triple-quantum (3Q) MAS NMR, 27Al -> 1H heteronuclear correlation (HETCOR) and high-resolution 3QMAS/HETCOR NMR techniques to KAlSi3O8 (Or), NaAlSi3O8 (Ab) and NaAlSiO4 (Ne) glasses containing 0~2 wt% H2O to shed light on the dissolution mechanisms of water in aluminosilicate melts (glasses). An Al Q3-OH group, characterized by 1H chemical shifts of 1.3–1.9 ppm, was identified for all hydrous glasses. Its abundance increases with bulk Al/Si ratio. The 27Al chemical shifts ({delta}iAl) of this species are 64–68 ppm, larger than those of Al Q4 by 3–6 ppm. Despite this difference, it is only through 27Al -> 1H HETCOR and 3QMAS/HETCOR, but not 27Al MAS or 3QMAS NMR that the peaks are resolved. This study has demonstrated that depolymerization and formation of AlOH/SiOH is a general water dissolution mechanism for polymerized aluminosilicate melts (glasses), and HETCOR NMR experiments involving 1H are the key to its revelation.

Key Words: NMR • water • aluminosilicate glass • heteronuclear correlation • 1H • 27Al • depolymerization




This article has been cited by other articles:


Home page
 American MineralogistHome page
W. J. Malfait
The 4500 cm-1 infrared absorption band in hydrous aluminosilicate glasses is a combination band of the fundamental (Si,Al)-OH and O-H vibrations
American Mineralogist, May 1, 2009; 94(5-6): 849 - 852.
[Abstract] [Full Text] [PDF]

Home page
 American MineralogistHome page
X. Xue
Water speciation in hydrous silicate and aluminosilicate glasses: Direct evidence from 29Si-1H and 27Al-1H double-resonance NMR
American Mineralogist, February 1, 2009; 94(2-3): 395 - 398.
[Abstract] [Full Text] [PDF]

Home page
 American MineralogistHome page
A. G. Whittington, M. A. Bouhifd, and P. Richet
AMORPHOUS MATERIALS: PROPERTIES, STRUCTURE, AND DURABILITY: The viscosity of hydrous NaAlSi3O8 and granitic melts: Configurational entropy models
American Mineralogist, January 1, 2009; 94(1): 1 - 16.
[Abstract] [Full Text] [PDF]


JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2009 by Mineralogical Society of America