Strength of polycrystalline niobium from high-pressure x-ray diffraction data: A comparison of results from line-width and line-shift analyses

Singh, AK and Liermann, HP (2015) Strength of polycrystalline niobium from high-pressure x-ray diffraction data: A comparison of results from line-width and line-shift analyses. Journal of Applied Physics, 118 . 065903-1-065903-5. ISSN 0021-8979

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    Abstract

    High purity polycrystalline niobium was compressed in a diamond anvil cell (DAC) without any pressure transmitting medium and the pressure was increased in steps of �5 GPa to the highest pressure of �40 GPa. The diffraction pattern was recorded after each pressure increment using angle-dispersive mode with the conventional diffraction geometry, wherein the primary x-ray beam is parallel to the load axis of the DAC. The strength of niobium as function of pressure was determined using the line-width and line-shift analyses. Both eY and 2eY, where Y is the aggregate Young’s modulus and e is the strain determined from the line-width analysis, have been used as the measure of strength in earlier studies. In this study, it is eY that agrees with the strength determined from the line-shift analysis of the radial diffraction data as well as the data from the conventional diffraction geometry. These results have been discussed and compared with a similar observation made earlier on strength of diamond. This study highlights the ambiguity that presently exists in choosing eY or 2eY as a measure of strength while attempting to estimate the strength from the diffraction line width analysis.

    Item Type: Journal Article
    Additional Information: Copyright for this article belongs to M/s. American Institute of Physics
    Uncontrolled Keywords: Polycrystalline niobium;Diamond anvil cell (DAC);Radial diffraction data;Conventional diffraction geometry
    Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
    Division/Department: Materials Science Division, Other
    Depositing User: Ms. Alphones Mary
    Date Deposited: 24 Aug 2015 14:57
    Last Modified: 24 Aug 2015 14:57
    URI: http://nal-ir.nal.res.in/id/eprint/12304

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