Strength of polycrystalline coarse-grained platinum to 330 GPa13; and of nanocrystalline platinum to 70 GPa from high-pressure13; x-ray diffraction data

Singh, AK and Liermann, Hanns-Peter and Akahama, Y and Saxena, SK and Menendez-Proupin, Eduardo (2008) Strength of polycrystalline coarse-grained platinum to 330 GPa13; and of nanocrystalline platinum to 70 GPa from high-pressure13; x-ray diffraction data. Journal of Applied Physics, 103 (6).

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    Abstract

    X-ray diffraction patterns from platinum foil (300 nm grain size) have been recorded up to 330 GPa using a beveled-anvil diamond cell. The compressive strength has been determined from the analysis of the diffraction linewidths. In a separate set of experiments, coarse-grained platinum powder (300 nm grain size) is compressed up to 64 GPa in a diamond anvil cell with 300 xB5;m flat-face anvils and diffraction patterns are recorded. The strengths as functions of pressure derived in the two sets of experiments agree well. The strength increases linearly from 0.21(2) GPa at zero pressure to 9.8(4) GPa at a pressure of 330 GPa. The nanocrystalline platinum sample (20 nm average grain size) exhibits much higher strength and increases linearly from 3.0(1) to 8.0(3) GPa as the pressure is increased from zero pressure to 70 GPa. The grain size of nanocrystalline sample decreases with increasing pressure. The effect of nonhydrostatic compression on the pressures determined with platinum as a pressure marker in high-pressure x-ray diffraction studies is discussed.

    Item Type: Journal Article
    Additional Information: Copyright for this article belongs to American Institute of Physics
    Uncontrolled Keywords: Compressive strength;Grain size;High-pressure effects; Nanostructured materials;X-ray diffraction 13;
    Subjects: AERONAUTICS > Aeronautics (General)
    Division/Department: Materials Science Division, Other, Other, Other, Other
    Depositing User: Ms. Alphones Mary
    Date Deposited: 30 Oct 2008
    Last Modified: 07 Jul 2010 13:23
    URI: http://nal-ir.nal.res.in/id/eprint/4886

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