Calibration of an isotopically enriched carbon-13 layer pressure sensor to 156 GPa in a diamond anvil cell

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作者：
Qiu, Wei [1 ]
Baker, Paul A. [1 ]
Velisavljevic, Nenad [1 ]
Vohra, Yogesh K. [1 ]
Weir, Samuel T. [2 ]
机构：
[1] Department of Physics, University of Alabama at Birmingham (UAB), Birmingham, AL 35294-1170
[2] Lawrence Livermore National Laboratory, University of California, P.O. Box 808, Livermore, CA 94550
来源：
Journal of Applied Physics | 2006年 / 99卷 / 06期
关键词：
An isotopically enriched C13 homoepitaxial diamond layer of 6±1 μm thickness was grown on top of a brilliant cut diamond anvil by a microwave plasma chemical vapor deposition process for application as a pressure sensor. This isotopically enriched diamond tip was then used in conjunction with a natural isotopic abundance diamond anvil to generate high pressure on the sample. We provide a calibration for the C13 Raman mode of this extremely thin epitaxial layer to 156 GPa using ruby fluorescence and the equation of state of copper as secondary pressure standards. The nonlinear calibration of the C13 Raman mode pressure sensor is compared with similar calibrations of C12 Raman edge and a good agreement is obtained. The Raman signal from the C13 epitaxial layer remained a distinct singlet to 156 GPa; and pressure calibration is independent of sample mechanical strength or the diamond anvil geometry. The use of even thinner layer would allow calibration further into ultrahigh pressure regime where the use of other optical sensors has proven to be difficult. © 2006 American Institute of Physics;
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