Optical properties of Bi3.25La0.75 Ti3O12 and Bi3.25Nd0.75 Ti3O12 thin films prepared by a chemical solution method

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Abstract

The optical properties of Bi3.25La0.75 Ti3O12 (BLT) and Bi3.25Nd0.75 Ti3O12 (BNT) thin films deposited on (111) Pt/Ti/SiO2/Si substrates by a chemical solution method were investigated. Both BLT and BNT thin films showed single phase of bismuth-layered structure. The BNT film composed of the homogeneous and large rod-like grains, while the grains in BLT film were small. The optical constants (refractive index and extinction coefficient) in the wavelength range of 200-1700 nm and the thickness of the films were obtained by spectroscopic ellipsometry measurements. The optical band gaps of BLT and BNT were estimated to be 4.30 and 3.61 eV, respectively. The dispersion of the refractive index in the interband transition region was analyzed by using the single electronic oscillator model.

Original languageEnglish
Pages (from-to)3900-3904
Number of pages5
JournalWuli Xuebao/Acta Physica Sinica
Volume54
Issue number8
StatePublished - Aug 2005
Externally publishedYes

Keywords

  • BiLa TiO and BiNd TiO thin films
  • Optical properties
  • Spectroscopic ellipsometry

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