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Optical characterization of ferroelectric Bi \(\mathsf{_{3.25}}\)La \(\mathsf{_{0.75}}\)Ti\(\mathsf{_{3}}\)O \(\mathsf{_{12}}\) thin films

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Abstract.

Amorphous and crystalline Bi3.25La0.75Ti3O12 (BLT) thin films on vitreous silica and sapphire substrates are prepared from chemical solutions. Their optical properties are investigated by transmittance measurements at energies from 1.1 to 5.0 eV. A four-phase model consisting of air, surface rough layer, BLT, and substrate is used to simulate the measured transmittance spectra. The inverse synthesis method with a double Tauc-Lorentz (DTL) dispersion function is used to calculate the optical constants and film thicknesses. The dispersion of the refractive index in the transparent region agrees with Sellmeier’s dispersion relation. The absorption edges of the BLT films are different in the amorphous and crystalline cases.

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Authors and Affiliations

  1. National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yu Tian Road, Shanghai, 200083, P.R. China

    Z. G. Hu, Z. M. Huang, Y. N. Wu, S. H. Hu, G. S. Wang, J. H. Ma & J. H. Chu

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  1. Z. G. Hu
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  2. Z. M. Huang
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  3. Y. N. Wu
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  4. S. H. Hu
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  5. G. S. Wang
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Correspondence to Z. G. Hu.

Additional information

Received: 25 February 2004, Published online: 28 May 2004

PACS:

78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity) - 78.66.Nk Insulators - 78.68. + m Optical properties of surfaces - 78.40.Ha Other nonmetallic inorganics

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Hu, Z.G., Huang, Z.M., Wu, Y.N. et al. Optical characterization of ferroelectric Bi \(\mathsf{_{3.25}}\)La \(\mathsf{_{0.75}}\)Ti\(\mathsf{_{3}}\)O \(\mathsf{_{12}}\) thin films. Eur. Phys. J. B 38, 431–436 (2004). https://doi.org/10.1140/epjb/e2004-00136-7

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  • DOI: https://doi.org/10.1140/epjb/e2004-00136-7

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