Lattice strains under megabar pressures

Singh, AK and Balasingh, C (2000) Lattice strains under megabar pressures. Metals Materials and Processes, 12 (2 amp;). pp. 281-292.

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    Abstract

    The diamond anvil cell (DAC) can be used to compress samples to a few megabars, and the use of synchrotron radiation as a source of intense X-ray beam allows diffraction patterns to be recorded from the samples at such high pressures. Such experiments give information on the phase transitions and the lattice strains under pressure. Under truly hydrostatic pressure, the lattice strains conform to the symmetry of the unit cell. The pressure in the megabar region tend to deviate appreciably from the hydrostatic condition. 'The modeling of the non-hydrostatic stress in a DAC and its effect on the lattice Strains are subjects of intense research activity. The13; analysis using appropriate theory of the lattice strain measured on a polycrystalline sample under non-hydrostatic13; condition can be used to estimate the shear strength and single crystal elastic moduli of the sample material as13; function of pressure. The pressure-volume relation of the sample material corresponding to hydrostatic compression13; naturally emerges from the analysis. This article reviews the experimental techniques and the present theoretical understanding of the non-hydrostatic effects.13;

    Item Type: Journal Article
    Additional Information: Copyright for this article belongs to Meshap Science Publishers
    Uncontrolled Keywords: Lattice strain;Megabar pressures;Diamond avil cell;Synchrotron radiation
    Subjects: CHEMISTRY AND MATERIALS > Metals and Metallic Materials
    CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
    Division/Department: Materials Science Division, Materials Science Division
    Depositing User: M/S ICAST NAL
    Date Deposited: 26 Aug 2008
    Last Modified: 17 Jun 2010 10:40
    URI: http://nal-ir.nal.res.in/id/eprint/4664

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