Domain structure and plasticity of CsHSO₄ crystals

Abstract

Results of investigation of domain structure and plastic properties of differently oriented CsHSO₄ in the ferroelastic phase III at 300 K and in the superionic phase I at 420 K are reported. In the phase III mechanical properties are found to be strongly anisotropic, the crystals are anomalously plastic under shear stress e ₁₃ and they are elastic and brittle under compression along the two-fold axis and perpendicular to the cleavage plane {100}. The domain walls with the {100} twinning plane are observed. The CsHSO4 crystals show superplasticity in the superionic phase I.

Key Words:

• Ferroelastic crystal
• domain
• plasticity