Abstract
Vibrational spectra of three-component BaTiO 3 SrTiO 3 CaTiO 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 determination of the ferroelectric phase transition temperature, T 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 c . The dependence of T c on the relative thicknesses of ferroelectric (BaTiO 3 ) to non-ferroelectric materials (SrTiO 3 and CaTiO 3 ) has been studied. The highest T c was found in superlattices having the largest relative amount of BaTiO 3 , provided that the superlattice maintains its coherency with the substrate. Strain relaxation leads to a significant decrease in the ferroelectric phase transition temperature.
Original language | American English |
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Article number | 054106 |
Journal | Physics Faculty Publications and Presentations |
Volume | 105 |
Issue number | 5 |
DOIs | |
State | Published - 9 Mar 2009 |
Keywords
- Raman spectra
- barium compounds
- calcium compounds
- dielectric polarisation
- ferroelectric materials
- ferroelectric transitions
- phonons
- pulsed laser deposition
EGS Disciplines
- Physics