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This is a detailed study of the synthesis parameters and their effects on the physical properties and ionic conductivity of gadolinium-doped ceria prepared using a glycine nitrate precursor combustion method.

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Gadolinium doped Ceria (GDC) is a known oxygen ion conductor in intermediate temperature range. This is a preliminary work aimed at exploring the suitability of using nanocrystalline GDC as oxygen sensor in intermediate operating temperature range (500 o C-700 o C). The nanocrystalline Gadolinium doped Ceria (GDC) has been prepared by sol-gel method with EDTA as chelating agent. Particle size around 10±5nm was obtained after calcination at 600 o C. Pellets prepared using this material were sintered 1350 o C, which show 90% of the theoretical density. The dc and ac (1Hz-1MHz) conductivity of these pellet was measured in the temperature range 200-600 o C and 500-700 o C respectively. Highest conductivity of the order of 4.61X10 -5 S/cm was recorded at 700 o C. Possible reasons for low conductivity are discussed.

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