Suppressed dependence of polarization on epitaxial strain in highly polar ferroelectrics.
A combined experimental and computational investigation of coupling between polarization and epitaxial strain in highly polar ferroelectric PbZr{sub 0.2}Ti{sub 0.8}O{sub 3} (PZT) thin films is reported. A comparison of the properties of relaxed (tetragonality c/a{approx}1.05) and highly strained (c/a{approx}1.09) epitaxial films shows that polarization, while being amongst the highest reported for PZT or PbTiO{sub 3} in either film or bulk forms (P{sub r}{approx}82 {mu}C/cm{sup 2}), is almost independent of the epitaxial strain. We attribute this behavior to a suppressed sensitivity of the A-site cations to epitaxial strain in these Pb-based perovskites, where the ferroelectric displacements are already large, contrary to the case of less polar perovskites, such as BaTiO{sub 3}. In the latter case, the A-site cation (Ba) and equatorial oxygen displacements can lead to substantial polarization increases.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 953806
- Report Number(s):
- ANL/MSD/JA-59216; PRLTAO; TRN: US201004%%565
- Journal Information:
- Phys. Rev. Lett., Vol. 98, Issue 2007; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- ENGLISH
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