Quick
Search: 		  
advanced search
 GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help 
European Journal of Mineralogy Signup for GSW Email News
JOURNAL HOME HELP FEEDBACK/COMMNET SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
European Journal of Mineralogy; November, December 2002; v. 14; no. 6; p. 1087-1094; DOI: 10.1127/0935-1221/2002/0014-1087
© 2002 E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
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
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by MORIN, G.
Right arrow Articles by CALAS, G.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

Articles

Native Cd+ in sedimentary fluorapatite

Guillaume MORIN*, Thierry ALLARD, Etienne BALAN, Philippe ILDEFONSE{dagger} and Georges CALAS

Laboratoire de Minéralogie-Cristallographie de Paris (LMCP), UMR CNRS 7590, Universités Paris 6 et 7 and IPGP, case 115, 4 Place Jussieu, F-75252 PARIS Cedex 05, France
{dagger} deceased 26 October 1999

* corresponding author, e-mail: Guillaume.Morin{at}lmcp.jussieu.fr

A native Cd+ centre (5s1, S = 1/2) was detected in natural sedimentary fluorapatite using Electron Paramagnetic Resonance (EPR). The Cd+ centre generated by artificial X-ray irradiation of the same sample has an EPR spectrum similar to the native Cd+ centre but differs in its thermal stability. The artificial Cd+ centre exhibits fast thermal decay, i.e., t1/2 = 380 ± 30 h at room temperature (RT), although the native centre is stable at RT. Comparison with Cd+ centres obtained by X-ray irradiation of synthetic Cd-doped fluorapatite samples indicates that both the native and artificial Cd+ centres correspond to Cd+ ions substituting for Ca2+ in the apatite structure. Comparison with other artificial Cd+ centres already reported in various minerals suggests that the Cd+ centre in the studied fluorapatite sample mainly occupies the Ca(1) site with coordination number [9]. The apparent stability of the native Cd+ centre is not yet explained but could be related to charge compensation.

Key-words: apatite, Cd+, EPR, ns1 centres, radiation-induced defects..






JOURNAL HOME HELP FEEDBACK/COMMNET SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2009 by E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers