Large angle convergent beam electron diffraction determinations of dislocation Burgers vectors in synthetic stishovite

P. Cordier, Thomas Sharp

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Polycrystalline stishovite, synthesized in a multi-anvil apparatus at 15 GPa and 1200°C, contains numerous dislocations. The microstructures of the recovered material have been investigated using Transmission Electron Microscopy (TEM). The Burgers vectors of the dislocations were determined using Large Angle Convergent Beam Electron Diffraction (LACBED). We find that <100>, <001>, <110> and <101> dislocations were activated in the stishovite during the synthesis experiments. Dislocation microstructures, indicative of dislocation glide, suggest that plastic deformation occurred during quench. Subgrain boundaries that are present in some grains indicate that some recovery occurred. As recovery is unlikely during quench, deformation also occurred during synthesis.

Original languageEnglish (US)
Pages (from-to)548-555
Number of pages8
JournalPhysics and Chemistry of Minerals
Volume25
Issue number8
DOIs
StatePublished - 1998

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stishovite
Burgers vector
Dislocations (crystals)
dislocation
Electron diffraction
diffraction
Recovery
electron
Microstructure
Plastic deformation
Transmission electron microscopy
microstructure
plastic deformation
Experiments
transmission electron microscopy
experiment

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Materials Science(all)

Cite this

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T1 - Large angle convergent beam electron diffraction determinations of dislocation Burgers vectors in synthetic stishovite

AU - Cordier, P.

AU - Sharp, Thomas

PY - 1998

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N2 - Polycrystalline stishovite, synthesized in a multi-anvil apparatus at 15 GPa and 1200°C, contains numerous dislocations. The microstructures of the recovered material have been investigated using Transmission Electron Microscopy (TEM). The Burgers vectors of the dislocations were determined using Large Angle Convergent Beam Electron Diffraction (LACBED). We find that <100>, <001>, <110> and <101> dislocations were activated in the stishovite during the synthesis experiments. Dislocation microstructures, indicative of dislocation glide, suggest that plastic deformation occurred during quench. Subgrain boundaries that are present in some grains indicate that some recovery occurred. As recovery is unlikely during quench, deformation also occurred during synthesis.

AB - Polycrystalline stishovite, synthesized in a multi-anvil apparatus at 15 GPa and 1200°C, contains numerous dislocations. The microstructures of the recovered material have been investigated using Transmission Electron Microscopy (TEM). The Burgers vectors of the dislocations were determined using Large Angle Convergent Beam Electron Diffraction (LACBED). We find that <100>, <001>, <110> and <101> dislocations were activated in the stishovite during the synthesis experiments. Dislocation microstructures, indicative of dislocation glide, suggest that plastic deformation occurred during quench. Subgrain boundaries that are present in some grains indicate that some recovery occurred. As recovery is unlikely during quench, deformation also occurred during synthesis.

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