A microprocessor-based semi-automatic apparatus for measuring high impedances in the low and very low frequency range

Very low frequency dielectric spectra (103-10-4 Hz) show space charge build-up in alpha PVDF under the influence of a low field as the temperature is raised to 80 degrees C or above. Preheating changes very little the medium frequency alternating conductivity when gold electrodes are used, whereas with aluminium electrodes the conductivity increases substantially as excess fluorine collects under the electrodes. Experimental results are interpreted through a two-carrier (H+ and F-) conduction model based upon three assumptions: (i) an increase in H+ ion concentration during the first heating: (ii) partial deep trapping of H+ ions at high temperature; (iii) field-induced extraction of F- ns from the bulk leading to H+ enhancement of pre-exponential mobility factor. Orders of magnitude are proposed for H+ and F- ion activation energies.

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Electrical properties at very low frequencies of alpha PVDF subjected to thermal cycling

Felix-Vandorpe

Maitrot

Ongaro

1985

J. Phys. D: Appl. Phys.

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A microprocessor-based semi-automatic apparatus for measuring high impedances in the low and very low frequency range

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Electrical properties at very low frequencies of alpha PVDF subjected to thermal cycling

Electrical properties at very low frequencies of alpha PVDF subjected to thermal cycling

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