Journal
RSC ADVANCES
Volume 5, Issue 4, Pages 2486-2492Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra11672k
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Funding
- postgraduate education and research programs in Petroleum and Petrochemical Technology (PPT Consortium)
- Rachadapisake Sompote fund, Chulalongkorn University
- Development and Promotion of Science and Technology, Thailand project (DPST)
- National Metal and Materials Technology Center (MTEC), Thailand [P-0030259]
- Marie Curie Intra European Fellowship within the seventh European Community Framework Programme [PIEFGA- 2009-252711]
- King Abdullah University of Science AMP
- Technology, Saudi Arabia
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Stoichiometry and oxygen diffusion properties of La2-xSrxNiO4 +/-delta with x -0.2, 0.4, 0.6, and 0.8 prepared via a sol-gel method were investigated in this study. Iodometric titration and thermogravimetric analysis were used to determine the oxygen non-stoichiometry. Over the entire compositional range, the samples exhibit oxygen hyperstoichiometry with the minimum value delta = 0.14 at x = 0.4. Mixed effects of reduction of oxygen excess and increasing valence of Ni were found to serve as charge compensation mechanisms; the former dominated at a low level of substitution, x < 0.4, while the latter dominated at higher levels of Sr (0.4 < x < 0.8). The highest oxygen diffusion coefficient was found for the minimum amount of Sr substitution, x = 0.2, continuously decreasing with x until x = 0.6. An unusual increase in D* was observed when the Sr content increased up to x = 0.8.
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