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A new diamond anvil cell for hydrothermal studies to 2.5 GPa and from -190 to 1200 ??C

Review of Scientific Instruments

By:
, , , and
DOI: 10.1063/1.1143931

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Abstract

A new style of diamond anvil cell (DAC) has been designed and built for conducting research in fluids at pressures to 2.5 GPa and temperatures from -190 to 120??C. The new DAC has been used for optical microscope observations and synchrotron x-ray diffraction studies. Fringes produced by interference of laser light reflected from top and bottom anvil faces and from top and bottom sample faces provide a very sensitive means of monitoring the volume of sample chamber and for observing volume and refractive index changes in samples that have resulted from transitions and reactions. X-ray diffraction patterns of samples under hydrothermal conditions have been made by the energy dispersive method using synchrotron radiation. The new DAC has individual heaters and individual thermocouples for the upper and lower anvils that can be controlled and can maintain temperatures with an accuracy of ??0.5??C. Low temperatures are achieved by introducing liquid nitrogen directly into the DAC. The equation of state of H2O and the ??-?? quartz transition are used to determine pressure with an accuracy of ??1% in the aqueous samples. The new DAC has been used to redetermine five isochores of H 2O as well as the dehydration curves of brucite, Mg(OH)2, and muscovite, KAl2(Si3Al)O10(OH)2.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
A new diamond anvil cell for hydrothermal studies to 2.5 GPa and from -190 to 1200 ??C
Series title:
Review of Scientific Instruments
DOI:
10.1063/1.1143931
Volume
64
Issue:
8
Year Published:
1993
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Review of Scientific Instruments
First page:
2340
Last page:
2345