Observation of pressure-induced phase transition of δ-AlOOH by using single-crystal synchrotron X-ray diffraction method

Takahiro Kuribayashi, Asami Sano-Furukawa, Toshiro Nagase

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Pressure-induced phase transition of δ-AlOOH was confirmed between 6.1 and 8.2 GPa by using a single-crystal synchrotron X-ray diffraction method. The phase transition is reversible and unquenchable. Results from analysis of the distribution of X-ray diffraction intensities at 8.2 GPa reveal an additional systematic, absence of k + l odd for 0kl in comparison with h + l odd for h0l observed prior to the phase transition (space group, P21 nm). The space group of the post-transition phase should be Pnnm or Pnn2 to satisfy the systematic absence rule. Crystal structure refinements of the post-transition phase conducted for the three models (Pnnm, Pnn2, and P21 nm) indicate that the space group of the post-transition phase is Pnnm. The O-O distance of hydrogen bond in the post-transition phase at 8.2 GPa is 2.439(6) Å and is significantly longer than the predicted distance (2.366 Å) of the hydrogen bond symmetrization in δ-AlOOH. The H distribution in the post-transition phase would display a fully disordered hydrogen bond pattern.

Original languageEnglish
Pages (from-to)303-312
Number of pages10
JournalPhysics and Chemistry of Minerals
Volume41
Issue number4
DOIs
Publication statusPublished - 2014 Apr

Keywords

  • Crystal structure
  • High pressure
  • Phase transition
  • Single-crystal X-ray diffraction
  • δ-AlOOH

ASJC Scopus subject areas

  • Materials Science(all)
  • Geochemistry and Petrology

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