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The stripe phase of the β-INC-α transformation of quartz under a uniaxial stress : optical and dilatometric investigation

Authors
  • Bachheimer, J.P.
Publication Date
Jan 01, 1988
Source
HAL
Keywords
Language
English
License
Unknown
External links

Abstract

Anomalies of optical rotation, light depolarization, birefringence and dilatation of crystal quartz under σyy uniaxial stresses confirm the existence of an incommensurate (1 q ) stripe phase, recently expected theoretically and discovered by neutron scattering, between the β and the INC (3 q) phases. The phase diagram is determined to a better resolution than with neutron diffraction. These anomalies allow us to obtain also the phase diagram of the 1 q phase under σ xx stresses. Both phase diagrams show the presence of the 1 q phase over a small temperature range (a few hundreth K), even at zero stress. As expected from theory, the variation of its temperature interval is found to be larger with σ yy stress than with σxx stress and the 1 q ↔ 3 q transition appears to be first-order.

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