Impedance spectroscopy study of the sintering of yttria-stabilized zirconia/magnesia composites

In the present study, the sintering of (ZrO 2:8 mol%Y 2O 3) 1 − m –(MgO) m , YSZ– mMg composites, with m in the 0–30 mol% range, has been investigated by impedance spectroscopy (IS), dilatometry, and X-ray diffraction. Impedance diagrams were collected at 400 °C after heating the green compacts up t...

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Bibliographic Details
Published in:Solid state ionics 2009-06, Vol.180 (11), p.822-826
Main Authors: Fonseca, F.C., de Florio, D.Z., Muccillo, R.
Format: Article
Language:English
Subjects:
Categories
Composite
Diffraction
Fuel cell
Heating
Impedance spectroscopy
Magnesium oxide
Sintering
Yttria stabilized zirconia
Zirconia
Zirconium dioxide
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Summary:In the present study, the sintering of (ZrO 2:8 mol%Y 2O 3) 1 − m –(MgO) m , YSZ– mMg composites, with m in the 0–30 mol% range, has been investigated by impedance spectroscopy (IS), dilatometry, and X-ray diffraction. Impedance diagrams were collected at 400 °C after heating the green compacts up to a selected sintering temperature, which was increased stepwise from 800 to 1400 °C. The combined experimental results revealed that the samples can be separated in two categories: below and above the solubility limit of MgO in the YSZ ( m ~ 10). Moreover, important microstructural features associated with both the sintering process and solid solution formation of YSZ– mMgO samples were correlated to the electrical properties inferred by IS.
ISSN:0167-2738
1872-7689
DOI:10.1016/j.ssi.2009.02.010