Uniaxial stress component in diamond anvil high-pressure x-ray cameras

Singh, AK and Balasingh, C (1977) Uniaxial stress component in diamond anvil high-pressure x-ray cameras. Journal of Applied physics, 48 (12). pp. 5338-5340.

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The experimental setups based on the principle of opposed anvils have been extensively used in x-ray diffraction studies of solids at elevated pressures.1-5 In these devices, the sample is pressured between the anvils(with or without a gasket)and the sample is pressurized fact that the sample possesses a finite -yield strength which invariably increases with increasing pressure and that the sample is pressurized by an uniaxial load, the pressure on the sample is hydrostatic.The stress distribution is cylindrically symmetric about the direction of loading, the axial component of stress being larger than the radial stress component.Such a pressure distribution can be bettered approximated by the superposition of a hydrostatic component and an unxial stress component along the direction of loading.For a tungsten carbide anvil setup it was shown that the unxial stress component produces a strain which depends on the indices of the reflection.6 Thus, the observed strain ,which is the sum of the strains arising from the hydrostatic component and from the unxial stress component , also depends on the indices of the reflection. Further, it was shown that the magnitude of the unixial stress component could be estimated by analyzing the x-ray diffraction data.The variation with pressure of the unxial stress component in sodium chloride7 was measured using this technique.

Item Type: Article
Additional Information: Copyright for this article belongs to American Institute of Physics
Uncontrolled Keywords: Perpendicular geometry;Parallel geometry;Tungsten carbide anvil apparatus
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: M/S ICAST NAL
Date Deposited: 19 May 2008
Last Modified: 17 Jun 2010 05:47
URI: http://nal-ir.nal.res.in/id/eprint/4713

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