A diamond gasket for the laser-heated diamond anvil cell

Guangtian Zou, Yanzhang Ma, Ho Kwang Mao, Russell J. Hemley, Stephen A. Gramsch

Research output: Contribution to journalConference articlepeer-review

35 Scopus citations

Abstract

Advances in laser heating techniques with diamond anvil cells have enabled direct investigations of materials under extreme pressure-temperature conditions. The success of uniform heating to the maximum temperatures at megabar pressures relies critically on maximizing the gasket thickness which in turn depends upon the shear strength of the gasket. We have used diamond powder, the strongest possible material, to formulate a gasket for in situ x-ray diffraction with double-sided laser heating. The increase in gasket thickness allows increases in sample and insulator thickness, thereby improving the quality and pressure-temperature range of the measurement. We did not observe any pressure difference within 40 μm of the center of the sample chamber and the temperature distribution across the sample itself is within ± 47 K. These improvements as well as the fact that the diamond gasket can allow the sample to remain in good condition after high P-T processing make it an extremely useful technique in diamond cell laser-heating experiments. As an example of the technique, we present in situ x-ray diffraction results for FeO to above 86 GPa and 3500 K.

Original languageEnglish
Pages (from-to)1298-1301
Number of pages4
JournalReview of Scientific Instruments
Volume72
Issue number2
DOIs
StatePublished - Feb 2001
EventAdvances in Laser Heated Diamond Cell Techniques - Chicago, IL, United States
Duration: May 25 2000May 27 2000

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