Ferroelectric phase transitions in three-component short-period superlattices studied by ultraviolet Raman spectroscopy
Journal Article
·
· Journal of Applied Physics
- Boise State University
- ORNL
- University of Puerto Rico
- Pennsylvania State University
Vibrational spectra of three-component BaTiO{sub 3}/SrTiO{sub 3}/CaTiO{sub 3} short-period superlattices grown by pulsed laser deposition with atomic-layer control have been investigated by ultraviolet Raman spectroscopy. Monitoring the intensity of the first-order phonon peaks in Raman spectra as a function of temperature allowed the determination of the ferroelectric phase transition temperature T{sub c}. Raman spectra indicate that all superlattices remain in the tetragonal ferroelectric phase with out-of-plane polarization in the entire temperature range below T{sub c}. The dependence of T{sub c} on the relative thicknesses of ferroelectric (BaTiO{sub 3}) to nonferroelectric materials (SrTiO{sub 3} and CaTiO{sub 3}) has been studied. The highest T{sub c} was found in superlattices having the largest relative amount of BaTiO{sub 3}, provided that the superlattice maintains its coherency with the substrate. Strain relaxation leads to a significant decrease in the ferroelectric phase transition temperature.
- Research Organization:
- Oak Ridge National Laboratory (ORNL)
- Sponsoring Organization:
- SC USDOE - Office of Science (SC)
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 950434
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 5 Vol. 105; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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