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

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Author(s):	Muccillo, R. ^[1] Total Authors: 1
Affiliation:	^[1] CMDMC Ctr Sci & Technol Mat Energy & Nucl Res Ins, BR-05422970 Sao Paulo - Brazil Total Affiliations: 1
Document type:	Journal article
Source:	Journal of Materials Research; v. 24, n. 5, p. 1780-1784, MAY 2009.
Web of Science Citations:	6
Abstract
Porous ZrO(2):8 Mol% Y(2)O(3) 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 `'(omega) x Z'(omega)] and {[}Z `'(omega) x 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. (AU)

FAPESP's process:	05/53241-9 - Study of intergranular phenomena in ceramic materials
Grantee:	Reginaldo Muccillo
Support Opportunities:	Research Projects - Thematic Grants