Impedance spectroscopy analysis of zirconia:8 mol% yttria solid electrolytes with graphite pore former

Porous ZrO2:8 mol% Y2O3 sintered ceramics were prepared by adding graphite powder as pore former before sintering. The thermal elimination of graphite was evaluated by thermogravimetric analysis. Impedance spectroscopy analysis was carried out in the 5 Hz to 13 MHz frequency range in specimens sinte...

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Bibliographic Details
Published in:Journal of materials research 2009-05, Vol.24 (5), p.1780-1784
Main Author: Muccillo, R.
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Biomaterials
Ceramic
Electrical properties
Inorganic Chemistry
Materials Engineering
Materials Science
Nanotechnology
Porosity
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Summary:Porous ZrO2:8 mol% Y2O3 sintered ceramics were prepared by adding graphite powder as pore former before sintering. The thermal elimination of graphite was evaluated by thermogravimetric analysis. Impedance spectroscopy analysis was carried out in the 5 Hz to 13 MHz frequency range in specimens sintered with and without pore former. The deconvolution of the impedance diagrams, [Z″(ω) × Z′(ω)] and [Z″(ω) × log f], and the numerical residuals resulting from the subtraction of normalized impedance spectroscopy diagrams measured in specimens with and without pore formers were evaluated. A comparison of the impedance diagrams of samples sintered with and without pore former shows evidence of a modification of the electrical response caused by pores. The results show the unequivocal ability of the impedance spectroscopy technique to gauge microstructural modification caused by the presence of pores in ionic conducting solids.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2009.0209