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An application of NPD to double-stage diamond anvil cells: XAS spectra of rhenium metal under high pressures above 300 GPa

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ABSTRACT We present the first application of double-stage diamond anvil cells (ds-DACs) to X-ray absorption spectroscopy (XAS) of Rhenium (Re) metal. By using highly stable and sub-micron sized X-ray beam,… Click to show full abstract

ABSTRACT We present the first application of double-stage diamond anvil cells (ds-DACs) to X-ray absorption spectroscopy (XAS) of Rhenium (Re) metal. By using highly stable and sub-micron sized X-ray beam, XAS spectra were successfully observed at the -edges from the sample encapsulated in the small space between the second-stage anvils. The pressure generation exceeding 300 GPa was evaluated by the pressure-induced shift of extended X-ray absorption fine structure (EXAFS) oscillation at the -edge. The profile of white-line at the -edges broadened with increasing pressure, which indicates the modification of the Re band structure. The present results demonstrate the high ability of XAS technique combined with ds-DACs as a probe for crystal structure and electronic structure under ultrahigh pressure.

Keywords: anvil cells; stage diamond; double stage; diamond anvil; stage; pressure

Journal Title: High Pressure Research
Year Published: 2019

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