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High Pressure Research
An International Journal
Volume 18, 2000 - Issue 1-6
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Paper Presented At The Conference: Chemistry

Equations of state of MgO at high pressure and temperature

D. Martíinez-García ICMUV, Ed. Investigación, p1.1, Dr. Moliner, 50, 46100, Burjassot, Valencia, Spain; LURE, Bât. 2090, Centre Universitaire Paris, Sud, 91405, Orsay, France
,
Y. Le Godec PMC, Université P&M Curie, T13, E4, B77, 4 Place Jussieu, 75252, Paris, France
,
M. Mézouar European Synchrotron Radiation Facility, Grenoble, 38043, France
,
G. Syfosse PMC, Université P&M Curie, T13, E4, B77, 4 Place Jussieu, 75252, Paris, France
,
J. P. Itié LURE, Bât. 2090, Centre Universitaire Paris, Sud, 91405, Orsay, France; PMC, Université P&M Curie, T13, E4, B77, 4 Place Jussieu, 75252, Paris, France
&
J. M. Besson PMC, Université P&M Curie, T13, E4, B77, 4 Place Jussieu, 75252, Paris, France
Pages 339-344 | Received 09 Sep 1999, Accepted 06 Jan 2000, Published online: 19 Aug 2006
 
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Abstract

A synchrotron X-ray diffraction study on MgO has been done at simultaneous high pressure and temperature. The lattice parameter of MgO has been measured up to a static pressure of 6 GPa and a temperature of 1273 K, using a large volume pressure cell and energy-dispersive synchrotron X-ray powder diffraction. The compression was made following six high-temperature isotherms. A Vinet equation of state was used to fit the experimental P-V-T data. The Vinet's model compares very well with the experimental data above the Debye temperature (760 K) and allows the use of MgO as an alternative internal pressure calibrant for experiments at high temperature.

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