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A new electron diffraction approach for structure refinement applied to Ca3Mn2O7.

R Beanland1, K Smith1, P Vaněk2

  • 1Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom.

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|May 4, 2021
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Summary

The digital large-angle convergent-beam electron diffraction (D-LACBED) technique reveals how Ca3Mn2O7

Keywords:
CBEDCa3Mn2O7LACBEDdigital diffractionelectron diffraction

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Area of Science:

  • Materials Science
  • Crystallography
  • Solid-State Chemistry

Background:

  • Ca3Mn2O7 exhibits complex structural properties influenced by temperature.
  • Understanding oxygen octahedral tilts is crucial for predicting material behavior.

Purpose of the Study:

  • To apply the digital large-angle convergent-beam electron diffraction (D-LACBED) technique to Ca3Mn2O7.
  • To investigate the temperature-dependent structural evolution of Ca3Mn2O7.

Main Methods:

  • Utilizing D-LACBED to analyze Ca3Mn2O7 across various temperatures.
  • Employing Bloch-wave simulations to interpret D-LACBED patterns.
  • Refining atomic coordinates, thermal displacement parameters, and occupancy.

Main Results:

  • D-LACBED demonstrated sensitivity to subtle structural changes in Ca3Mn2O7.
  • Observed decay of anti-phase oxygen octahedral tilts perpendicular to the c-axis with increasing temperature.
  • Confirmed robustness of in-phase oxygen octahedral tilts about the c-axis up to ~400°C.

Conclusions:

  • The D-LACBED technique is effective for precise structural analysis of materials like Ca3Mn2O7.
  • Structural changes in Ca3Mn2O7 are strongly correlated with temperature-induced octahedral tilting.
  • Limitations exist in distinguishing certain octahedral tilt types due to the D-LACBED technique's sampling.