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Structural evolution of Sc-containing zirconia electrolytes |
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| Authors: | F Tietz W Fischer Th Hauber G Mariotto |
| Institution: | a Forschungszentrum Jülich GmbH, Institut für Werkstoffe der Energietechnik (IWE), D-52425, Jülich, Germany b Forschungszentrum Jülich GmbH, Institut für Energieverfahrenstechnik (IEV), D-52425, Jüllich, Germany c Istituto Nazionale per la Fisica della Materia (INFM) and Dipartimento di Fisica, Università di Trento, I-38050, Povo, Italy |
| Abstract: | A powder of nominal composition (ZrO2)0.886(Sc2O3)0.104(Al2O3)0.01 was synthesized by spray drying with the purpose of testing the performance of solid oxide fuel cells containing scandia-stabilized zirconia (ScSZ) as electrolyte. The phases resulting from calcination and sintering at different temperatures were investigated by XRD, impedance and Raman spectroscopy. At sintering temperatures of 1200–1400 °C nearly equal amounts of cubic and rhombohedral ScSZ were detected, whereas heat treatment higher than 1500 °C led to a cubic single-phase material. A preliminary reaction mechanism of phase formation is proposed with respect to the various results depending on heat treatment. |
| Keywords: | Solid oxide fuel cell Zirconia-scandia electrolyte X-ray diffraction Impedance spectroscopy Raman spectroscopy |
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