Quick
Search: 		  
advanced search
 GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help 
American Mineralogist RIMG advertisement
JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
American Mineralogist; January 2004; v. 89; no. 1; p. 31-38
© 2004 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 (3)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Liebscher, A.
Right arrow Articles by Gottschalk, M.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

The T-X dependence of the isosymmetric displacive phase transition in synthetic Fe3+-Al zoisite: A temperature-dependent infrared spectroscopy study

Axel Liebscher* and Matthias Gottschalk

GFZ Potsdam, Section 4.1, Telegrafenberg, D-14473 Potsdam, Germany

Correspondence: * E-mail: alieb{at}gfz-potsdam.de

We have studied three synthetic Al-Fe3+ zoisites with variable Fe3+-contents [Xps = 0.0, 0.035 (12), and 0.062 (23)] by means of temperature-dependent infrared powder spectroscopy. Spectra were recorded from –150 to 170 °C in steps of 20 °C in the lattice vibrational range 400 to 1200 cm –1. At –150°C, a total of 34 bands could be identified in all samples. With increasing temperature, the bands broaden and generally shift smoothly to lower wave numbers. The maxima of bands at ~620 and ~909 cm –1 as well as the autocorrelation analysis of the spectral region 820 to 1050 cm –1 display linear but different temperature dependencies of the spectral properties at low and high temperatures. These changes in temperature dependence of the spectral properties marks the isosymmetric displacive phase transition between zoisite I and II. The transition temperatures Ttr are about 45 °C for Xps = 0.0 and = 0.035 (12), and about –35 °C for Xps = 0.062 (23) and suggest a negative correlation between Ttr and Xps. A combination with literature data yields a positive slope of 9.4 ±2.0 MPa/K and a {Delta} S of 0.5 ± 0.1 J/(K·mol) for the zoisite I -> zoisite II transition for a composition of about Xps = 0.035.




This article has been cited by other articles:


Home page
 American MineralogistHome page
S. Ohi, A. Miyake, N. Shimobayashi, M. Yashima, and M. Kitamura
An isosymmetric phase transition of orthopyroxene found by high-temperature X-ray diffraction
American Mineralogist, October 1, 2008; 93(10): 1682 - 1685.
[Abstract] [Full Text] [PDF]

Home page
 Eur J MineralHome page
P. Schmid-Beurmann, F. Brunet, V. Kahlenberg, and E. Dachs
Polymorphism and thermochemistry of MgAlPO4O, a product of lazulite breakdown at high temperature
European Journal of Mineralogy, March 1, 2007; 19(2): 159 - 172.
[Abstract] [Full Text] [PDF]

Home page
 Reviews in Mineralogy and GeochemistryHome page
M. Gottschalk
Thermodynamic Properties of Zoisite, Clinozoisite and Epidote
Reviews in Mineralogy and Geochemistry, January 1, 2004; 56(1): 83 - 124.
[Full Text] [PDF]

Home page
 Reviews in Mineralogy and GeochemistryHome page
A. Liebscher
Spectroscopy of Epidote Minerals
Reviews in Mineralogy and Geochemistry, January 1, 2004; 56(1): 125 - 170.
[Full Text] [PDF]


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