Ferroelastic domain switching behaviour of single crystals

Abstract

We investigated ferroelastic domain switching due to stress in single crystals grown by a slow evaporation method. The ferroelastic domain switching stress due to the saturation effect is about 0.9 MPa. The temperature dependence of the stress-strain hysteresis was also studied. From this result, it was determined that the single crystal undergoes a phase transition near K. In other words, the phase transition due to an external mechanical stress applied to crystals causes a transformation from the ferroelastic to the paraelastic phase. From these results, it was confirmed that crystals have ferroelastic characteristics below .

Depression of the ferroelastic phase transition in LiCsSO4 by uniaxial stress

“…The term 1 6 γ 6 was included as the phase transition point is close to the tricritical point [34]. The term ξ η 6 describes the bilinear coupling of the order parameter with spontaneous deformation η 6 and is significant when the transversal wave corresponding to the soft c 66 component of the elasticity tensor propagates in the crystal.…”

“…The term 1 6 γ 6 was included as the phase transition point is close to the tricritical point [34]. The term ξ η 6 describes the bilinear coupling of the order parameter with spontaneous deformation η 6 and is significant when the transversal wave corresponding to the soft c 66 component of the elasticity tensor propagates in the crystal. For the longitudinal ultrasonic wave, the coupling between the order parameter and the wave deformation is square-linear [35] -term ζ 2 η 2 -and describes the stepwise changes in its velocity in the phase transition region.…”

“…The transition of order-disorder type and the mechanism leading to the ordered phase involves rotations of the SO 4 tetrahedra in the ab plane * E-mail: zbigtyl@amu.edu.pl [3,4]. According to the rules of symmetry changes [5], this phase is ferroelastic and the macroscopic order parameter is the spontaneous deformation η 6 , bilinearly coupled with the microscopic order parameter. The ferroelasticity of LiCsSO 4 crystal was established by direct observation of a stress-strain hysteresis curve by Lim et al [6], who also studied the domain structure through 7 Li and 133 Cs Nuclear Magnetic Resonance (NMR) [7].…”

“…According to the rules of symmetry changes [5], this phase is ferroelastic and the macroscopic order parameter is the spontaneous deformation η 6 , bilinearly coupled with the microscopic order parameter. The ferroelasticity of LiCsSO 4 crystal was established by direct observation of a stress-strain hysteresis curve by Lim et al [6], who also studied the domain structure through 7 Li and 133 Cs Nuclear Magnetic Resonance (NMR) [7]. The most interesting features are the anomalous changes in the elasticity tensor components accompanying this phase transition, of which the most pronounced are those in c 66 as it decreases by one order of magnitude.…”

Ferroelastic crystals and their nonlinear elastic properties observed in frequency range from gigahertz to milihertz

“…In the paraelastic phase, it has orthorhombic structure mmm and at T C ¼ 201 K it undergoes a transition to the ferroelastic phase of monoclinic symmetry 2/m [62][63][64][65][66][67][68] in which the presence of ferroelastic domains mutually oriented at 90 have been observed [17]. In the crystal, the existence of an intermediate phase below T C has been suggested [20,67,68].…”