The Elastic Behaviour of Ferroelastic SbsOTI Polytype 2 MC Studied by Ultrasonic Experiments* and Brillouin Scattering '~'
نویسنده
چکیده
The temperature dependence of the elastic functions of the improper ferroelastic polytype 2 MC-SbsOTI has been investigated in the temperature range from room temperature to well above the structural phase transition at T~=481 K. The stiffnesses c(c*c*), c(a,a), c22 and c(c*a) show a considerable softening up to 20% around Tc whereas c44 remains unaffected by the phase transition. The experimental results are discussed considering cubic and quartic anharmonic coupling between two components of the zone boundary order parameter and elastic waves.
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تاریخ انتشار 2005