Physics – Condensed Matter – Materials Science
Scientific paper
2007-09-27
Phys. Rev. B 75, 134102 (2007)
Physics
Condensed Matter
Materials Science
20 pages, 4 figures
Scientific paper
10.1103/PhysRevB.75.134102
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.
Daraktchiev Maren
Lee Weonjong
Redfern S.
Salje E.
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