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The Optical Properties and Band Gap Energy of Nanocrystalline La 0.4 Sr 0.6 TiO 3 Thin Films
Author(s) -
Suzuki Toshio,
Jasinski Piotr,
Petrovsky Vladimir,
Anderson Harlan U.
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00216.x
Subject(s) - nanocrystalline material , materials science , band gap , annealing (glass) , grain size , sapphire , thin film , spin coating , microstructure , analytical chemistry (journal) , mineralogy , optics , nanotechnology , optoelectronics , metallurgy , chemistry , laser , physics , chromatography
The effects of microstructure on the optical properties of La 0.4 Sr 0.6 TiO 3 thin films were investigated. Dense films with the thickness of ∼200 nm and grain size 14–30 nm were produced on monocrystalline sapphire substrates by using a polymeric precursor spin coating technique at annealing temperatures under 800°C. X‐ray data showed the formation of a single‐phase cubic perovskite‐type structure similar to undoped SrTiO 3 for annealing temperatures >500°C. The results of optical measurements showed that the optical spectra varied with the change of the grain size. From these data, the absorption coefficients were calculated and the band gap energy determined. In agreement with the quantum confinement model, it was shown that the band gap energy increased as the grain size decreased.