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New impedance spectroscopy for the study of dynamics of ionic transport: Case example in AgAsS2
Authors: Patil Deepak | Zima Vítězslav | Frumar Miloslav | Wágner Tomáš | Shimakawa Koichi
Year: 2012
Type of publication: ostatní do riv
Page from-to: nestránkováno
Titles:
Language Name Abstract Keywords
cze New impedance spectroscopy for the study of dynamics of ionic transport: Case example in AgAsS2 Dynamics of ionic transport is studied by conventional impedance spectroscopy (IS), in which the impedance data are used for determining parameter of an equivalent electric circuit. The main drawback of the conventional impedance spectroscopy is that it does not provide detail information about the dynamics of electronic properties. In IS of typical ionic conductors, the shape of real vs. imaginary part of the impedance plot with respect to applied frequency- consists of a high-frequency semicircle or its part and a low-frequency tail. The high-frequency semicircle represents properties of the bulk material and low-frequency tail is due to the electrode polarization. However the exact mechanism of the electrode polarization and dynamics of the ions are not explained by this approach. We tried to overcome a drawback of conventional IS using an advanced concept of evaluation impedance spectroscopy data. In this concept the use of an equivalent circuit is not needed; the important parameters, such as number of freely moving ions, ion jumping frequency etc, can be obtained directly from our new approach (the random-walk of carriers). Here we also present a full analysis of the electrode polarization behaviour with respect to the applied voltage. chalkogenidové sklo; spektroskopie; elektrické vlastnosti
eng New impedance spectroscopy for the study of dynamics of ionic transport: Case example in AgAsS2 Dynamics of ionic transport is studied by conventional impedance spectroscopy (IS), in which the impedance data are used for determining parameter of an equivalent electric circuit. The main drawback of the conventional impedance spectroscopy is that it does not provide detail information about the dynamics of electronic properties. In IS of typical ionic conductors, the shape of real vs. imaginary part of the impedance plot with respect to applied frequency- consists of a high-frequency semicircle or its part and a low-frequency tail. The high-frequency semicircle represents properties of the bulk material and low-frequency tail is due to the electrode polarization. However the exact mechanism of the electrode polarization and dynamics of the ions are not explained by this approach. We tried to overcome a drawback of conventional IS using an advanced concept of evaluation impedance spectroscopy data. In this concept the use of an equivalent circuit is not needed; the important parameters, such as number of freely moving ions, ion jumping frequency etc, can be obtained directly from our new approach (the random-walk of carriers). Here we also present a full analysis of the electrode polarization behaviour with respect to the applied voltage. chalcogenide glass; impedance spectroscopy; electrical properties

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