Quick
Search: 		  
advanced search
 GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help 
American Mineralogist Email Content Delivery
JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
American Mineralogist; February 2000; v. 85; no. 2; p. 270-278
© 2000 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 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 Google Scholar
Google Scholar
Right arrow Articles by Chopelas, A.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

Thermal expansivity of mantle relevant magnesium silicates derived from vibrational spectroscopy at high pressure

Anastasia Chopelas*

Max Planck Institut für Chemie, Postfach 3060, 55020 Mainz, Germany

Thermal expansivities for the MgSiO3 phases of orthoenstatite, high clinoenstatite, ilmenite, and majorite; and for stishovite were estimated using the thermodynamic Maxwell relation ({partial}S/{partial}P)T = –({partial}V/{partial}T)P where the entropies at high pressures were derived using a statistical method and spectroscopic data. The spectroscopically determined thermal expansivities for all minerals are in excellent agreement with previously determined volumetric data, where available. A value of 3.25(10) x 10–5 K–1 for orthoenstatite at room temperature was obtained; this value is situated in the middle of the large spread of reported values and is in excellent agreement with the two latest volumetric determinations. For high clinoenstatite, {alpha} at room T is estimated as 2.56(9) x 10–5 K–1. This method provides good high temperature estimates of {alpha} for the high-pressure polymorphs, where data are scanty or unavailable. Included in this report are previous data for the Mg2SiO4 phases and MgO for completeness. The following equations may be used to extrapolate a to higher temperatures at 1 atm in 10–5 K–1: {alpha}(majorite) = 2.95 + 0.000521x; {alpha}({gamma}-Mg2SiO4) = 2.70 + 0.000648x; {alpha}(ilmenite) = 2.64+ 0.000537x; {alpha}(perovskite) = 2.51 + 0.000805x; and {alpha}(stishovite) = 2.19 + 0.000485x, where x is (T/K-750).




This article has been cited by other articles:


Home page
 Geological Society of America Special PapersHome page
S. D. King and H. L. Redmond
The structure of thermal plumes and geophysical observations
Geological Society of America Special Papers, January 1, 2007; 430(0): 103 - 120.
[Abstract] [Full Text] [PDF]

Home page
 American MineralogistHome page
F. Nestola, G. D. Gatta, and T. B. Ballaran
The effect of Ca substitution on the elastic and structural behavior of orthoenstatite
American Mineralogist, May 1, 2006; 91(5-6): 809 - 815.
[Abstract] [Full Text] [PDF]

Home page
 Eur J MineralHome page
S. C. TARANTINO, T. B. BALLARAN, M. A. CARPENTER, M. C. DOMENEGHETTI, and V. TAZZOLI
Mixing properties of the enstatite-ferrosilite solid solution: II. A microscopic perspective
European Journal of Mineralogy, June 1, 2002; 14(3): 537 - 547.
[Abstract] [Full Text] [PDF]

Home page
 American MineralogistHome page
R. J. Angel and J. M. Jackson
Elasticity and equation of state of orthoenstatite, MgSiO3
American Mineralogist, April 1, 2002; 87(4): 558 - 561.
[Abstract] [Full Text] [PDF]


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