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Anhydrous Phase B: Transmission Electron Microscope Characterization and Elastic Properties.

A Addad1, P Carrez1, P Cordier1

  • 1Université de Lille, CNRS, INRA, ENSCL, UMR 8207 - UMET - Unité Matériaux et Transformations Lille France.

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|November 26, 2019
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Summary
This summary is machine-generated.

Anhydrous phase B and stishovite directly form from olivine under high pressure and temperature. Their structures and properties were calculated using advanced microscopy and computational methods.

Keywords:
anhydrous phase Btransmission electron microscopy

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Area of Science:

  • Mineral Physics
  • Geochemistry
  • Materials Science

Background:

  • Olivine is a major component of Earth's upper mantle.
  • Understanding high-pressure mineral transformations is crucial for seismology and planetary science.

Purpose of the Study:

  • To investigate the direct formation of anhydrous phase B and stishovite from olivine.
  • To determine the crystal structure of anhydrous phase B.
  • To calculate the elastic and seismic properties of anhydrous phase B.

Main Methods:

  • High-pressure and high-temperature experiments (14 GPa, 1400 °C).
  • Precession electron diffraction tomography in transmission electron microscopy.
  • Ab initio calculations for structure determination.
  • Elastic and seismic property calculations.

Main Results:

  • Anhydrous phase B and stishovite were successfully synthesized directly from olivine.
  • The crystal structure of anhydrous phase B was determined.
  • Elastic and seismic properties of anhydrous phase B were calculated.

Conclusions:

  • The direct transformation of olivine to anhydrous phase B and stishovite occurs under specific mantle conditions.
  • The determined properties of anhydrous phase B provide insights into seismic wave propagation in the deep Earth.