Method: Nanocrystalline powder of 10 mol% indium oxide doped ceria is synthesized
by mechanically alloying the stiochiometric powder mixture of CeO2 and In2O3 within
5 h of milling in open air. Further milling up to 8 h confirms the stable cubic structure of the
compound with increase in milling time.
Objective: Detailed structure and microstructure of the compound have been characterized by
Rietveld powder structure and microstructure refinement method using XRD data and analyzing
HRTEM images. Effect of In2O3 doping on electrical conductivity of nanocrystalline
CeO2 is studied by measuring the electrical conductivity of the compound in the temperature
range 300°C-600°C. The DC conductivity of doped ceria (σdc ~ 3x10-4 S/cm at 540°C for
doped ceria) has been enhanced to ~100 times in comparison to that of the undoped ceria (σdc
~ 4x10-6 S/cm at 540°C) nanoparticles has been found.
Conclusion: This significant increment in electrical conductivity has been interpreted
through the microstructure characterization of the doped compound.
Keywords: Oxides, milling, defects, x-ray diffraction, microstructure, electrical conductivity.
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