Physics and Chemistry of Minerals

, Volume 20, Issue 3, pp 176–189 | Cite as

Structural transformations of quartz and berlinite AlPO4 at high pressure and room temperature: a transmission electron microscopy study

  • P. Cordier
  • J. C. Doukhan
  • J. Peyronneau
Article

Abstract

Single crystals of α-quartz and α-berlinite AlPO4 have been compressed at high pressure and room temperature in a diamond anvil cell (DAC). The pressure-induced microstructures have been studied on recovered specimens using transmission electron microscopy. As previously reported, quartz is shown to exhibit an amorphous transition at high pressure (≈30 GPa). Under the markedly non-hydrostatic conditions of the present study, a wide mixed-phase regime in which amorphous lamellae form within the crystalline matrix is encountered at lower values of the mean stress. The amorphous lamellae are interpreted as shear lamellae. The formation of these shear lamellae as well as their habit planes are described by the evolution with pressure of shear moduli μ as computed in anisotropic elasticity. Our calculations also show instabilities at higher pressure of the elastic moduli (i.e. of the α-quartz structure) which are related to the amorphous transition. Berlinite exhibits a more ductile behavior with simultaneous dislocation activity and shear on amorphous lamellae which become pervasive at high pressure (≈10 GPa). These amorphous lamellae of berlinite do not revert to crystal when pressure is released.

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Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • P. Cordier
    • 1
  • J. C. Doukhan
    • 1
  • J. Peyronneau
    • 2
  1. 1.Laboratoire de Structure et Propriétés de l'Etat Solide — UA CNRS 234Université des Sciences et Technologies de LilleVilleneuve d'Ascq CedexFrance
  2. 2.Institut de Physique du Globe de ParisLaboratoire des GéomatériauxParisFrance

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