Quick
Search: 		  
advanced search
 GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help 
American Mineralogist Don't get GSW? Talk to your librarian.
JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
American Mineralogist; November 2002; v. 87; no. 11-12; p. 1686-1691
© 2002 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 ISI 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 ISI Web of Science (2)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Mookherjee, M.
Right arrow Articles by Harlov, D. E.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

Orientational order-disorder of N(D,H)4+ in tobelite

Mainak Mookherjee1,*, Simon A.T. Redfern1,2, Ming Zhang1 and Daniel E. Harlov3

1 Mineral Physics Group, Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, U.K.
2 Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia
3 GeoForschungsZentrum Potsdam, Telegrafenberg, D-14473 Potsdam, Germany

Correspondence: * E-mail: mm329{at}cam.ac.uk

Orientational order-disorder behavior of NH4+ is a well-established phenomenon in certain ammonium halides and ammonium salts. Anticipating similar behavior of ammonium in the interlayer site of tobelite, synthetic ND4/NH4 tobelite has been studied by infrared spectroscopy from room temperature down to 20 K. Both ND4 and NH4 are found to occupy the interlayer site in this mica structure. The spectra show noticeable changes on cooling. Autocorrelation analysis reveals distinct changes in the line width of the central autocorrelation peak. This is attributed to the transition of the ND4+ group from an orientationally disordered state at higher temperatures to a relatively ordered state below a critical temperature of 140 K. The order parameter for the transition follows classical second-order behavior as a function of temperature.




This article has been cited by other articles:


Home page
 American MineralogistHome page
G. L. Hovis, G. L. Hovis, D. Harlov, and M. Gottschalk
Solution calorimetric determination of the enthalpies of formation of NH4-bearing minerals buddingtonite and tobelite
American Mineralogist, January 1, 2004; 89(1): 85 - 93.
[Abstract] [Full Text] [PDF]


JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2008 by Mineralogical Society of America