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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

Texto completo
Autor(es):
Muccillo, R. [1]
Número total de Autores: 1
Afiliação do(s) autor(es):
[1] CMDMC Ctr Sci & Technol Mat Energy & Nucl Res Ins, BR-05422970 Sao Paulo - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Journal of Materials Research; v. 24, n. 5, p. 1780-1784, MAY 2009.
Citações Web of Science: 6
Resumo

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)

Processo FAPESP: 05/53241-9 - Estudo de fenômenos intergranulares em materiais cerâmicos
Beneficiário:Reginaldo Muccillo
Linha de fomento: Auxílio à Pesquisa - Temático