Infrared spectroscopy of CaTiO3, SrTiO3, BaTiO 3, Ba0.5Sr0.5TiO3 thin films, and (BaTiO3)5/(SrTiO3)5 superlattice grown on SrRuO3/SrTiO3(001) substrates

S. S.A. Seo, H. N. Lee, T. W. Noh

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

We investigated infrared-active phonons of CaTiO3, SrTiO 3, BaTiO3, and Ba0.5Sr0.5TiO 3 thin films, and a (BaTiO3)5/(SrTiO 3)5 artificial superlattice by a Fourier transform infrared spectrometer with a grazing angle (48°) incident reflectance method. The longitudinal phonon energies of the thin films were different from those of the bulk material due to the lattice strain of the substrate. The Ba0.5Sr0.5TiO3 thin film and (BaTiO 3)5/(SrTiO3)5 superlattice showed different phonon modes due to structural discrepancies, even though their chemical compositions are similar. The Ba0.5Sr0.5TiO 3 thin film showed a single phonon energy lying between the phonon energies of BaTiO3 and SrTiO3 thin films, while the (BaTiO3)5/(SrTiO3)5 superlattice well preserved the characteristic phonon modes of BaTiO3 and SrTiO3 thin films.

Original languageEnglish
Pages (from-to)94-97
Number of pages4
JournalThin Solid Films
Volume486
Issue number1-2
DOIs
StatePublished - Aug 22 2005

Bibliographical note

Funding Information:
This work is supported by the Ministry of Science and Technology through the Creative Research Initiative program in Korea, and one of the authors (HNL) acknowledges support from the U.S. Department of Energy under Contract No. DE-AC05-00OR22725 with the Oak Ridge National Laboratory, managed by UT-Battelle, LLC, as part of a BES NSET initiative on Nanoscale Cooperative Phenomena and of the LDRD Program.

Keywords

  • Dielectrics
  • Infrared spectroscopy
  • Superlattices
  • Titanium oxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Infrared spectroscopy of CaTiO3, SrTiO3, BaTiO 3, Ba0.5Sr0.5TiO3 thin films, and (BaTiO3)5/(SrTiO3)5 superlattice grown on SrRuO3/SrTiO3(001) substrates'. Together they form a unique fingerprint.

Cite this