Title of article :
Electrical conductivity of polycrystalline (CeO2)0.80(LaO1.5)0.20 with a small amount of (LaF3)0.95(SrF2)0.05
Author/Authors :
Lang، نويسنده , , H.-J and Künstler، نويسنده , , K and Tomandl، نويسنده , , G، نويسنده ,
Issue Information :
هفته نامه با شماره پیاپی سال 2003
Pages :
5
From page :
189
To page :
193
Abstract :
Adding 1 wt.% of the fluorine-ion conducting (LaF3)0.95(SrF2)0.05 to polycrystalline oxygen-ion conducting (CeO2)0.80(LaO1.5)0.20 solid solution, the effect on the electrical conductivity is studied as a function of sintering temperature. Highly sinterable (CeO2)0.80(LaO1.5)0.20 starting powder was fabricated by co-precipitation using oxalate method and followed by a hydrothermal treatment. The oxide conductivity was measured by DC and AC four-probe techniques at high oxygen partial pressures between 0.21 and 1 bar. The polycrystalline microstructure of the sintered specimens was investigated by transmission electron microscopy (TEM). The oxide conductivity is slightly increased by the addition of 1 wt.% (LaF3)0.95(SrF2)0.05 to polycrystalline (CeO2)0.80(LaO1.5)0.20, provided the specimens were sintered above 1500 °C. At sintering temperatures above 1700 °C, (LaF3)0.95(SrF2)0.05 was detected at the grain boundaries of the polycrystalline (CeO2)0.80(LaO1.5)0.20. Obviously, the (LaF3)0.95(SrF2)0.05 generates ion-conducting pathways between the (CeO2)0.80(LaO1.5)0.20 grains causing a higher grain boundary conductivity.
Keywords :
electrical conductivity , (LaF3)0.95(SrF2)0.05 , microstructure , Grain boundary , (CeO2)0.80(LaO1.5)0.20
Journal title :
Solid State Ionics
Serial Year :
2003
Journal title :
Solid State Ionics
Record number :
1714961
Link To Document :
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