Phase Coexistence Near a Morphotropic Phase Boundary in Sm-doped BiFeO3 Films

Details Phase Coexistence Near a Morphotropic Phase Boundary in Sm-doped BiFeO3 Films Phase Coexistence Near a Morphotropic Phase Boundary in Sm-doped BiFeO3 Films

2010-03-11

arxiv.org/abs/1003.2360v2

Physics

Condensed Matter

Materials Science

Scientific paper

We have investigated heteroepitaxial films of Sm-doped BiFeO3 with a Sm-concentration near a morphotropic phase boundary. Our high-resolution synchrotron X-ray diffraction, carried out in a temperature range of 25C to 700C, reveals substantial phase coexistence as one changes temperature to crossover from a low-temperature PbZrO3-like phase to a high-temperature orthorhombic phase. We also examine changes due to strain for films greater or less than the critical thickness for misfit dislocation formation. Particularly, we note that thicker films exhibit a substantial volume collapse associated with the structural transition that is suppressed in strained thin films.

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