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Bismuth titanate thin films prepared by wet-chemical techniques: effect of sol ageing time

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Abstract

In this work, layered perovskite bismuth titanate (Bi4Ti3O12) thin films were fabricated on α-alumina substrates by spin coating process. Precursor sol was prepared by sol–gel process from bismuth nitrate and titanium butoxide in concentrated acetic acid, with diethylamine as a stabilizer. Processes occurring in the precursor sol were followed in the ageing period of 20 days. Thin films prepared from the as-synthesized and aged sols are crack-free, with the thickness of ~1 μm, uniform surface texture and rounded grains having grain size in nanometer range. Sintering of thin films was performed at various temperatures, and sintered thin films exhibited dense structure, fully crystallized with typical Aurivillius phase and without any preferred orientation and impurity phase. The influence of ageing of the precursor sol on the microstructure of obtained thin films was also investigated. Direct relation between hydrodynamic diameter of precursor particles and the morphology and the grain size of the obtained films was observed.

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Acknowledgments

The authors gratefully acknowledge the financial support provided by the Ministry of Science of the Republic of Serbia, project no. III45021. We also kindly thank the Institute of Materials Research, Slovak Academy of Sciences and the Colloid Chemistry division at the Faculty of Technology, University of Novi Sad, for the AFM and rheology measurements performed in their laboratories.

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  1. Nikolina Pavlović

    Present address: IMO, Inorganic and Physical Chemistry, Hasselt University, Agoralaan Building D, Diepenbeek, Belgium

Authors and Affiliations

  1. Department of Materials Engineering, Faculty of Technology, University of Novi Sad, Bul. Cara Lazara 1, 21000, Novi Sad, Serbia

    Vladimir V. Srdić, Bojana Mojić, Branimir Bajac & Nikolina Pavlović

  2. Department of Physics, Faculty of Natural Sciences, University of Novi Sad, Trg Dositeja Obradovića 3, 21000, Novi Sad, Serbia

    Srđan Rakić

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  1. Vladimir V. Srdić
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  2. Bojana Mojić
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  3. Branimir Bajac
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  5. Nikolina Pavlović
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Correspondence to Vladimir V. Srdić.

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Srdić, V.V., Mojić, B., Bajac, B. et al. Bismuth titanate thin films prepared by wet-chemical techniques: effect of sol ageing time. J Sol-Gel Sci Technol 62, 259–265 (2012). https://doi.org/10.1007/s10971-012-2723-9

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  • DOI: https://doi.org/10.1007/s10971-012-2723-9

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