Abstract
Films of HfO2 – 10 mol% Yb2O3 (HY) electrolyte were prepared on yttria–stabilized zirconia (YSZ) substrates by chemical solution deposition. 10-fold dip-coating followed by synthesis at 1100 °C, 1h resulted in formation of 6.5 μm thick films with nanogranular morphology. The across-plane electrical conductivity of the films was studied by electrochemical impedance spectroscopy using a Pt|YSZ|HY-film|Pt cell in the temperature range from 400 to 800°C. For correct separation of the film conductivity, the impedance measurements were also carried out on a reference Pt|YSZ|Pt cell with a blank YSZ sample. Methods of equivalent circuits and distribution of relaxation times were used for deconvolution of the impedance spectra of the cells. It was found that charge transport across the film is hindered by low grain boundary conductivity.
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