Abstract
Composites of 3 mol % Y2O3 in ZrO2, Ce0.9Gd0.1O1.95, and Sc0.1Ce0.01Zr0.89O1.95 were mixed with 8 mol % Yttria Stabilized Zirconia (YSZ) in 50:50 weight ratio to compare the influences in mechanical and electrical properties using a 3- point bending test and AC-impedance spectroscopy, respectively. An SEM was used for a morphological analysis and an XRD was used to identify phases. The composite of 3YSZ+8YSZ has shown a mixed phase between small and large grains referring to the cubic and tetragonal phases. From AC-impedance measurements, the composite of 8YSZ+ScSZ shows the maximum bulk and grain boundaries conductivities. The mechanical strength of 8YSZ has been proved to increase tremendously when mixed with the tetragonal phase of 3YSZ. However, The maximum bending strength is obtained from 8YSZ+ScSZ composite after sintering for 4 hours. The results have shown very positive solution using a composite of 8YSZ+ScSZ for the intermediate temperature electrolyte for SOFCs.
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