Structure refinement of sub-cubic-mm volume sample at high pressures by pulsed neutron powder diffraction: Application to brucite in an opposed anvil cell

Takuo Okuchi, Naotaka Tomioka, Narangoo Purevjav, Jun Abe, Stefanus Harjo, Wu Gong

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Neutron powder diffraction measurements of 0.9 mm3 of mixture of deuterated brucite and pressure medium were conducted at pressures to 2.8 GPa, using an opposed anvil cell and a medium-resolution diffractometer at Japan Proton Accelerator Research Complex pulsed neutron source. Spurious-free diffraction patterns were successfully obtained and refined to provide all structural parameters including Debye-Waller factors. Tilting of hydroxyl dipoles of brucite toward one of the three nearest-neighbor oxygen anions was confirmed to be substantial at pressure as low as 1.5 GPa. By this application, technical feasibility to analyze such a small sample has been newly established, which would be useful to extend the applications of neutron diffraction at high pressures.

Original languageEnglish
Pages (from-to)273-280
Number of pages8
JournalHigh Pressure Research
Volume34
Issue number2
DOIs
Publication statusPublished - Apr 3 2014

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Keywords

  • hydrogen
  • pulsed neutron powder diffraction
  • structure refinement

ASJC Scopus subject areas

  • Condensed Matter Physics

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