Diverging Relaxation Times of Domain Wall Motion Indicating Glassy Dynamics in Ferroelastics

作者：Puchberger Sabine; Soprunyuk Viktor; Schranz Wilfried^*

来源：Materials Research, 2018, 21(suppl 2): UNSP e20170842.

DOI：10.1590/1980-5373-MR-2017-0842

• domain wall motion
• glass transition
• dynamic mechanical analysis

Single crystals of PbZrO3 and LaAlO3 have been studied by Dynamic Mechanical Analysis measurements in the low frequency range f = 0.02-50 Hz. The complex Young's modulus exhibits a quite rich behavior and depends strongly on the direction of the applied dynamic force. The low frequency elastic response in the [110](c) - direction is dominated by domain wall motion, leading to a superelastic softening effect below T-c. With decreasing temperature this superelastic softening gradually disappears, due to an increasing relaxation time tau(DW) of domain wall motion. For PbZrO3,tau(DW) seems to diverge at a finite temperature T-VF, indicating glassy behavior of domain freezing.

• 出版日期2018