Pulsed neutron powder diffraction at high pressure by a capacity-increased sapphire anvil cell

Takuo Okuchi, Masashi Yoshida, Yoshiki Ohno, Naotaka Tomioka, Narangoo Purevjav, Toyotaka Osakabe, Stefanus Harjo, Jun Abe, Kazuya Aizawa, Shigeo Sasaki

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A new design of opposed anvil cell for time-of-flight neutron powder diffraction was prepared for use at advanced pulsed sources. A couple of single-crystal sapphire sphere anvils and a gasket of fully hardened Ti-Zr null alloy were combined to compress 35 mm3 of sample volume to 1 GPa and 11 mm3 to 2 GPa of pressures, respectively. A very high-quality powder diffraction pattern was obtained at Japan Proton Accelerator Research Complex for a controversial high pressure phase of methane hydrate. The counting statistics, resolution, absolute accuracy and d-value range of the pattern were all improved to be best suitable for precise structure refinement. The sample is optically accessible to be measured by Raman and fluorescence spectroscopy during and after compression. The current cell will be an alternative choice to study hydrogenous materials of complex structures that are stable at the described pressure regime.

Original languageEnglish
Pages (from-to)777-786
Number of pages10
JournalHigh Pressure Research
Volume33
Issue number4
DOIs
Publication statusPublished - Dec 1 2013

Keywords

  • Pulsed neutron powder diffraction
  • Raman spectroscopy
  • high pressure
  • hydrogen
  • opposed anvil cell

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Okuchi, T., Yoshida, M., Ohno, Y., Tomioka, N., Purevjav, N., Osakabe, T., Harjo, S., Abe, J., Aizawa, K., & Sasaki, S. (2013). Pulsed neutron powder diffraction at high pressure by a capacity-increased sapphire anvil cell. High Pressure Research, 33(4), 777-786. https://doi.org/10.1080/08957959.2013.852190