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Impedance spectroscopy analysis of TinO2n-1 Magnéli phases


Reference:

Regonini, D., Dent, A. C. E., Bowen, C. R., Pennock, S. R. and Taylor, J., 2011. Impedance spectroscopy analysis of TinO2n-1 Magnéli phases. Materials Letters, 65 (23-24), pp. 3590-3592.

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    Official URL:

    http://dx.doi.org/10.1016/j.matlet.2011.07.094

    Abstract

    This letter presents a comprehensive impedance spectroscopy characterisation of Magneli phases (TinO2n-1) over a range of temperatures, which are of interest in electrochemistry and sensing applications, with the aim to enhance the understanding of their electrical properties and influence their microstructure. The impedance of the TinO2n-1 can be resolved into two different contributions, namely the grain bulk (RB) and grain boundaries (RGB). The ac conductivity increases with frequency and temperature, following a universal power law. The high relative permittivity (105-106), which is relatively frequency independent from 0.1Hz to 100kHz, is attributed to the presence of insulating grain boundaries (RGBRB) creating an Internal Barrier Layer Capacitor (IBLC) effect. Above 100kHz, the grain boundaries begin to contribute to the ac conductivity and the permittivity drops sharply.

    Details

    Item Type Articles
    CreatorsRegonini, D., Dent, A. C. E., Bowen, C. R., Pennock, S. R. and Taylor, J.
    DOI10.1016/j.matlet.2011.07.094
    DepartmentsFaculty of Engineering & Design > Electronic & Electrical Engineering
    Faculty of Engineering & Design > Mechanical Engineering
    Research CentresMaterials Research Centre
    RefereedYes
    StatusPublished
    ID Code25860

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