Absence of low-temperature phase transitions in epitaxialthin films
- 3 May 2004
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 69 (17), 174101
- https://doi.org/10.1103/physrevb.69.174101
Abstract
We have studied phase transitions in epitaxial thin films by Raman spectroscopy. The films are found to remain in a single ferroelectric phase over the temperature range from 5 to 325 K. The low-temperature phase transitions characteristic of bulk (tetragonal-orthorhombic-rhombohedral) are absent in the films. X-ray diffraction shows that the films are under tensile strain due to the thermal expansion mismatch with the buffer layer. A phase-field calculation of the phase diagram and domain structures in thin films predicts, without any priori assumption, that an orthorhombic phase with in-plane polarization is the thermodynamically stable phase for such values of tensile strain and temperature, consistent with the experimental Raman results.
Keywords
This publication has 34 references indexed in Scilit:
- Effect of substrate constraint on the stability and evolution of ferroelectric domain structures in thin filmsActa Materialia, 2002
- Thermodynamic theory of epitaxial ferroelectric thin films with dense domain structuresPhysical Review B, 2001
- Phase-field model of domain structures in ferroelectric thin filmsApplied Physics Letters, 2001
- Polarization Instability in Polydomain Ferroelectric Epitaxial Thin Films and the Formation of Heterophase StructuresPhysical Review Letters, 2000
- Ferroelectricity in thin films: The dielectric response of fiber-textured (BaxSr1−x)Ti1+yO3+z thin films grown by chemical vapor depositionJournal of Applied Physics, 1999
- Ferroelectric, dielectric and piezoelectric properties of ferroelectric thin films and ceramicsReports on Progress in Physics, 1998
- Thermodynamics of polydomain heterostructures. III. Domain stability mapJournal of Applied Physics, 1998
- Effect of Mechanical Boundary Conditions on Phase Diagrams of Epitaxial Ferroelectric Thin FilmsPhysical Review Letters, 1998
- Thermodynamics of polydomain heterostructures. I. Effect of macrostressesJournal of Applied Physics, 1998
- Domain configurations due to multiple misfit relaxation mechanisms in epitaxial ferroelectric thin films. I. TheoryJournal of Applied Physics, 1994