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Preparation of dielectric Bi4 − xLaxTi3O12 (x~2) from K2La2Ti3O10 via exfoliation and restacking routes

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2013, 23(1), pp.14-19
  • DOI : 10.6111/JKCGCT.2013.23.1.014
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

A Young Jeon 1 고지은 1 Jong-Young Kim 1

1한국세라믹기술원

Accredited

ABSTRACT

We have successfully synthesized Bi4 − xLaxTi3O12 (x~2) having Aurivillius-type layered perovskite structure from exfoliated layered perovskite oxide of K2La2Ti3O10 with Ruddlesden-Popper structure. The reaction between the exfoliated lanthanum titanate nanosheets and BiOCl nanocrystal resulted in the formation of polycrystalline Bi4 − xLaxTi3O12 (x~2) after heating above 700oC. Colloidal suspension of the nanosheets could be obtained by intercalating ethylamine (EA) into the protonated lanthanum titanate, H2La2Ti3O10, derived from K2La2Ti3O10. Transmission electron microscopic (TEM) analysis show that the exfoliated lanthanium titanate nanosheets have a thickness of a few nano meters. According to X-ray diffraction (XRD) analysis, the exfoliated lanthanium titanate was found to be transformed into Bi4 − xLaxTi3O12 (x~2) after restacking with BiOCl and subsequent thermal treatment at > 700oC.

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