Infrared spectroscopy of CaTiO₃, SrTiO₃, BaTiO₃, Ba_0.5Sr_0.5TiO₃ thin films, and (BaTiO₃)₅/(SrTiO₃)₅ superlattice grown on SrRuO₃/SrTiO₃(001) substrates

Journal Article · Sat Jan 01 00:00:00 EST 2005 · Thin Solid Films

OSTI ID:1003687

Lee, Ho Nyung ^[1]; Seo, S. S. A. ^[2]; Noh, Tae Won ^[2]

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1. ORNL
2. Seoul National University

We investigated infrared-active phonons of CaTiO3, SrTiO3, BaTiO3, and Ba0.5Sr0.5TiO3 thin films, and a (BaTiO3)5/(SrTiO3)5 artificial superlattice by a Fourier transform infrared spectrometer with a grazing angle (48{sup o}) 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 (BaTiO3)5/(SrTiO3)5 superlattice showed different phonon modes due to structural discrepancies, even though their chemical compositions are similar. The Ba0.5Sr0.5TiO3 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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1003687
• Journal Information: Thin Solid Films, Vol. 486; ISSN 0040-6090
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHEMICAL COMPOSITION
INFRARED SPECTROMETERS
PHONONS
SPECTROSCOPY
STRAINS
SUBSTRATES
SUPERLATTICES
THIN FILMS