Strength of polycrystalline coarse-grained platinum to 330 GPa and of nanocrystalline platinum to 70 GPa from high-pressure x-ray diffraction dataReport as inadecuate




Strength of polycrystalline coarse-grained platinum to 330 GPa and of nanocrystalline platinum to 70 GPa from high-pressure x-ray diffraction data - Download this document for free, or read online. Document in PDF available to download.

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X-ray diffraction patterns from platinum foil 300 nm grain size have been recorded up to330 GPa using a beveled-anvil diamond cell. The compressive strength has been determined fromthe analysis of the diffraction linewidths. In a separate set of experiments, coarse-grained platinumpowder 300 nm grain size is compressed up to 64 GPa in a diamond anvil cell with 300 mflat-face anvils and diffraction patterns are recorded. The strengths as functions of pressure derivedin the two sets of experiments agree well. The strength increases linearly from 0.21 2 GPa at zeropressure to 9.8 4 GPa at a pressure of 330 GPa. The nanocrystalline platinum sample 20 nmaverage grain size exhibits much higher strength and increases linearly from 3.0 1 to 8.0 3 GPaas the pressure is increased from zero pressure to 70 GPa. The grain size of nanocrystalline sampledecreases with increasing pressure. The effect of nonhydrostatic compression on the pressuresdetermined with platinum as a pressure marker in high-pressure x-ray diffraction studies isdiscussed.



Author: Menéndez Proupin, Eduardo; - Singh, Anil K.; - Liermann, Hanns-Peter; - Akahama, Yuichi; - Saxena, Surendra K.; -

Source: http://repositorio.uchile.cl/



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