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    Gutiérrez-Lázaro, Carmen Bretos, Iñigo Jiménez, Ricardo Ricote, Jesús Hosiny, Hitham El Pérez-Mezcua, Dulce Jiménez Rioboó, Rafael J. García-Hernández, Mar Calzada, Maria L. and Riman, R. 2013. Solution Synthesis of BiFeO3Thin Films onto Silicon Substrates with Ferroelectric, Magnetic, and Optical Functionalities. Journal of the American Ceramic Society, p. n/a.

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Use of the solvent chemistry for the control of the critical thickness of PbTiO3 ultrathin films

  • Roberto Fernández (a1), Susana Holgado (a2), Zhaorong Huang (a3), Maria L. Calzada and Jesús Ricote (a1)
  • DOI:
  • Published online: 01 January 2011

The preparation of high-quality ferroelectric PbTiO3-based ultrathin films by chemical solution deposition, using a diol-based sol-gel method, has proved to be successful. However, there is a critical thickness below which the films break up into isolated structures. According to previous studies, above a certain grain size to thickness ratio a microstructural instability occurs and the coatings are no longer continuous. We explore the use of the solvent chemistry to control this phenomenon, as an alternative to the more conventional variation of the crystallization parameters. The use of diols with short C chain lengths leads to films with smaller grain sizes, whose critical thicknesses are lower. A reduction from 40 to 15 nm is achieved by reducing the number of C of the diol used from 5 to 2. A critical value of G/t < 5.0 is necessary to obtain continuous ultrathin films with the processing conditions used.

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