Computer simulation of ferrielectric domain walls in ferroelastic CaTiO3

demonstrated that twin walls possess almost the same compressibility as the bulk.

The Ti–Ti repetition length inside the wall was approximately 0.2% greater than

the equivalent lattice parameter of the bulk. A slight reduction in the uniaxial

compressibility perpendicular to the twin wall was compared with predictions of

various theoretical models which give either large softening or large hardening.

Simple spring models predicted correctly that any change was expected to be small

for relevant potentials far from the ferroelastic transition point

The Intrinsic Elasticity of Twin Walls: Ferrielectric Twin Walls in Ferroelastic

CaTiO3. L.Goncalves-Ferreira, S.A.T.Redfern, E.Atacho, E.K.H.Salje: Applied

Physics Letters, 2009, 94[8], 081903