Abstract
Suitably oriented and cut strain gauged crystals of synthetic α quartz have been subjected to uniaxial compressive stress with the aid of a stiff, 2MN press.
Complete axial and lateral strain versus stress curves were obtained during stress-induced Dauphiné twinning and eventual complete volumetric transition to the alternate structural state. The alternate twinned state as revealed by observed stress-strain curves, is attained by either a continuous domain wall movement or by a sudden intricate composite transition process after reaching a critical coercive stress.
Lateral strain versus stress curves indicate that contraction occurs in two perpendicular directions during compression in two of the three orientations studied, and that a change in sign of the lateral strains usually accompanies the final transition to the alternate structural state. The order and the sign of observed lateral and axial strains before and after transformation, is confirmed by theory.
The movement of twin domain walls is explained in terms of ferrobielasticity. The initial development of stripe-shaped Dauphiné twins requires stress concentrations between the contact surfaces of a crystal and the platens of the press.
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Markgraaff, J. Elastic behavior of quartz during stress induced dauphiné twinning. Phys Chem Minerals 13, 102–112 (1986). https://doi.org/10.1007/BF00311900
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DOI: https://doi.org/10.1007/BF00311900