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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

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In situ solid state electrochemical impedance spectroscopy of NiO scales

Liu, H. and Mojica-Calderon, C and Lyon, S.B. and Stack, M.M. (1999) In situ solid state electrochemical impedance spectroscopy of NiO scales. Solid State Ionics, 126 (3-4). pp. 363-372. ISSN 0167-2738

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Abstract

NiO scales thermally grown on pure nickel were characterised by in situ solid state electrochemical impedance spectroscopy (EIS). Possible sources of error including the amplitude of the applied sine wave signals, the input impedance of FRA, as well as the residence time at the measuring temperature were examined. Specimens oxidised in air for 6, 24 and 120 h at 800 degrees C respectively were characterised over the temperature range 150-700 degrees C. The results suggest that only one time constant charge transport process is dominant in the NiO scales. The temperature dependence of the electrical conductivity shows an activation energy of about 0.6 eV which is consistent with measurements on hulk NiO pellets. The capacitance and dielectric constants of NiO scales also show a strong dependence of temperature.