Effect of internal friction on transformation twin dynamics in SrxBa1-xSnO3 perovskite

TL;DR

This study investigates how internal friction influences the movement of transformation twins in SrxBa1-xSnO3 perovskite during phase transitions, using mechanical analysis to understand energy dissipation and twin dynamics.

Contribution

It provides new insights into the role of internal friction and twin wall behavior during phase transitions in perovskite materials.

Findings

Relaxation peaks observed in orthorhombic and tetragonal phases

No energy dissipation detected in the cubic phase

Twin wall dynamics linked to bending modes and anisotropy energies

Abstract

The dynamics of transformation twins in SrxBa1-xSnO3 (x=0.6,0.8) perovskite has been studied by dynamical mechanical analysis in three-point bend geometry. This material undergoes phase transitions from orthorhombic to tetragonal and cubic structures on heating. The mechanical loss signatures of the transformation twins include relaxation and frequency-independent peaks in the orthorhombic and tetragonal phases, with no observed energy dissipation in the cubic phase. The macroscopic shape, orientation and relative displacements of twin walls have been calculated from bending and anisotropy energies. The mechanical loss angle and distribution of relaxation time are discussed in term of bending modes of domain walls.