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Updated: Feb 9, 2026

In Situ Characterization of Boehmite Particles in Water Using Liquid SEM
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Pressure-induced stacking disorder in boehmite.

Y Ishii1, K Komatsu, S Nakano

  • 1Geochemical Research Center, Graduate School of Science, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan.

Physical Chemistry Chemical Physics : PCCP
|June 7, 2018
PubMed
Summary
This summary is machine-generated.

Under pressure, aluminum layered hydroxide boehmite exhibits stacking disorder due to layer displacement. This structural change impacts hydrogen bonds, potentially hindering proton-tunnelling.

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Area of Science:

  • Materials Science
  • Mineral Physics
  • Crystallography

Background:

  • Boehmite (γ-AlOOH) is an aluminum layered hydroxide with a layered structure.
  • Understanding its structural behavior under pressure is crucial for materials science applications.

Purpose of the Study:

  • To investigate the structural evolution of boehmite under high pressure.
  • To elucidate the mechanism of pressure-induced structural changes and their impact on hydrogen bonding.

Main Methods:

  • In situ synchrotron X-ray diffraction and neutron diffraction were employed.
  • Structure refinements were performed on a deuterated sample up to 10 GPa.
  • X-ray scattering profile calculations were used to model the disordered structure.

Main Results:

  • Pressure induces stacking disorder in boehmite, characterized by increasing displacement of AlO6 octahedral layers along the a-axis.
  • This is the first experimental evidence of pressure-induced stacking disorder driven by continuous layer displacement.
  • Hydrogen bond distances (O-D and D-O) approach and merge under pressure, with asymmetry induced by stacking disorder.

Conclusions:

  • Pressure significantly alters the layered structure of boehmite, leading to stacking disorder.
  • The observed structural changes influence hydrogen bond geometries and may reduce proton-tunnelling probability.
  • This study provides new insights into the high-pressure behavior of layered hydroxides.