Electromechanical coupling in anodic niobium oxide: Electric field-induced strain, internal stress, and dielectric response

Francesco Di Quarto, Van Overmeere, La Mantia, Blaffart, Proost

    Risultato della ricerca: Articlepeer review

    11 Citazioni (Scopus)

    Abstract

    Seemingly, contradictory results have been reported so far for electrostriction in anodic oxides. Furthermore, no definitive agreement could be obtained with theory. In this paper, in situ techniques are combined to elucidate electrostriction in anodic niobium oxide. The dependence of strain, internal stress, and dielectric constant on the electric field is measured by, respectively, spectroscopic ellipsometry, curvature, and impedance measurements. The through-thickness strain is tensile and proportional to the square of the electric field. The in-plane internal stress is compressive and proportional to the square of the electric field at low field values. The internal stress is predicted relatively well by the Maxwell stress because of the weak dependence of the dielectric constant on the volume change of the oxide. The dielectric constant decreases with the electric field, the dependence being quadratic. While the evolution of the strain and stress with the electric field can be ascribed to the dependence of the dielectric constant on strain, the dependence of the dielectric constant on the electric field contains an explicit strain and electric field dependence. A mechanism for the latter is proposed.
    Lingua originaleEnglish
    Numero di pagine8
    RivistaJournal of Applied Physics
    VolumeVolume 111, Issue 11, 1 June 2012, Article number113529
    Stato di pubblicazionePublished - 2012

    All Science Journal Classification (ASJC) codes

    • ???subjectarea.asjc.3100.3100???

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