Dielectric properties of BaTiO3 thin films prepared by laser ablation

Junya Fujita, Keigo Suzuki, Nobuyuki Wada, Yukio Sakabe, Kazuo Takeuchi, Yoshimichi Ohki

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    To study the minimum particle size for a ferroelectric material at which ferroeiectricity is retained, thin films composed of stoichiometric BaTiO 3 nanoparticles were prepared by laser ablation of a Ba-Ti-O ceramic target using a differential mobility analyzer. Highly densified films of various uniform grain sizes were obtained after post-annealing at 600, 700, 800, and 900 °C in an oxygen atmosphere. The dielectric constants of the post-annealed films varied from 100 to 300, depending on the grain size from 65 to 136 nm. These values are comparable to those of BaTiO3 nano-granular films fabricated by metallorganic decomposition or the sol-crystal method. From the capacitance vs bias-voltage relationship and its hysteresis observed for the post-annealed films, it became clear that a phase transformation from paraelectric to ferroelectric occurs at a grain size of approximately 76 nm. It was also clarified from piezoresponse images of the post-annealed films obtained using a scanning probe microscope that ferroelectricity emerges in BaTiO3 nano-size grains at a grain size of approximately 55 nm.

    Original languageEnglish
    Pages (from-to)7806-7812
    Number of pages7
    JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
    Volume45
    Issue number10 A
    DOIs
    Publication statusPublished - 2006 Oct 15

    Fingerprint

    Laser ablation
    Dielectric properties
    laser ablation
    dielectric properties
    grain size
    Thin films
    thin films
    Ferroelectric materials
    Ferroelectricity
    ferroelectric materials
    ferroelectricity
    Sols
    Bias voltage
    phase transformations
    Hysteresis
    analyzers
    Microscopes
    Permittivity
    Capacitance
    capacitance

    Keywords

    • Barium titanate
    • Dielectric property
    • Ferroelectricity
    • Laser ablation
    • Nanoparticle

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

    Cite this

    Dielectric properties of BaTiO3 thin films prepared by laser ablation. / Fujita, Junya; Suzuki, Keigo; Wada, Nobuyuki; Sakabe, Yukio; Takeuchi, Kazuo; Ohki, Yoshimichi.

    In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 45, No. 10 A, 15.10.2006, p. 7806-7812.

    Research output: Contribution to journalArticle

    Fujita, Junya ; Suzuki, Keigo ; Wada, Nobuyuki ; Sakabe, Yukio ; Takeuchi, Kazuo ; Ohki, Yoshimichi. / Dielectric properties of BaTiO3 thin films prepared by laser ablation. In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers. 2006 ; Vol. 45, No. 10 A. pp. 7806-7812.
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