Quick
Search: 		  
advanced search
 GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help 
Clays and Clay Minerals Email Content Delivery
JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Clays and Clay Minerals; February 2005; v. 53; no. 1; p. 18-27; DOI: 10.1346/CCMN.2005.0530103
© 2005 Clay Minerals Society
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
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 Web of Science (1)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Kustrowski, P.
Right arrow Articles by Dziembaj, R.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

SUBSTITUTION OF Fe3+ FOR Al3+ CATIONS IN LAYERED DOUBLE HYDROXIDE [LiAl2(OH)6]2 CO3·nH2O

Piotr Kustrowski*, Agnieszka Wegrzyn, Alicja Rafalska-Lasocha, Agnieszka Pattek-Janczyk and Roman Dziembaj

Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland

* E-mail address of corresponding author: kustrows{at}chemia.uj.edu.pl

Synthesis of the Li-Al-Fe layered double hydroxides was performed by the coprecipitation method at constant pH (11.0 ± 0.2) and temperature (40 ± 2°C). Structural features of the as-synthesized samples were investigated by X-ray diffraction (XRD), infrared (IR) spectroscopy, scanning electron microscopy and Mössbauer spectroscopy. The samples consisted of well crystallized [LiFexAl2–x(OH)6]2CO3·nH2O phases with strict ordering of M+ and M3+ cations in the sheets. However, only a proportion of A13+ could be substituted by Fe3+ ions. The excess Fe3+ cations formed a separate ferrihydrite phase. Incorporation of Fe into the hydrotalcite-like structure resulted in an increase in the a lattice parameter determined by XRD. In addition, a shift of IR absorption bands, ascribed to the stretching vibrations of interlayer CO2–3 anions as well as the transitional motions of oxygen in the layers, to lower frequencies was observed. The presence of Fe3+ in the octahedral sheets caused a splitting of the band assigned to the stretching vibrations of the layer OH groups. Mössbauer experiments revealed that Fe exists in the synthesized samples in two different chemical environments. A proportion of the Fe3+ cations is incorporated as isolated ions in the [LiFexAl2–x(OH)6]2CO3·nH2O crystal structure. However, Fe3+ ions forming the ferrihydrite phase are dominant in the Fe-rich materials.

Key Words: FTIR • Hydrotalcite-like Compounds • Li-Al-Fe Layered Double Hydroxides • Mössbauer Spectroscopy • SEM • XRD






JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2009 by Clay Minerals Society