Journal
RSC ADVANCES
Volume 5, Issue 116, Pages 95736-95743Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra20251e
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Funding
- Department of Science and Technology (Govt. of India) [SR/FTP/PS-141-2010]
- DST (Govt. of India) under departmental FIST programme [SR/FST/PS-II-001/2011]
- University Grants Commission (UGC) for departmental CAS scheme [F.530/5/CAS/2011(SAP-I)]
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Defect associates and their interactions with charge carriers, influencing the ion dynamics have been discussed for Gd3+ and Y3+ co-doped nanocrystalline ceria. Detailed Rietveld analysis of the X-Ray Diffraction data confirmed the single phase cubic fluorite structure of the compositions with the space group Fm (3) over barm. An overall increase of the lattice parameter with Gd3+ ion concentration has been found. Grain and specific grain boundary conductivity have been evaluated from the complex impedance plots. A higher value dielectric constant has been observed for a co-doped sample at 20 mol% doping concentration. The interaction between dopant cations with oxygen vacancies has been found to form different defect associates and defect clusters. The association energy of co-doped samples at a 20 mol% doping concentration is observed to be a minimum in comparison with the singly doped samples of the same concentration. It has also been found that different defect clusters have a significant role on ionic conduction. The correlation among structural parameters, dielectric and conductivity responses has been discussed and established.
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