Issue 4, 2015

Effect of Sr substituted La2−xSrxNiO4+δ (x = 0, 0.2, 0.4, 0.6, and 0.8) on oxygen stoichiometry and oxygen transport properties

Abstract

Stoichiometry and oxygen diffusion properties of La2−xSrxNiOδ 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 δ = 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.

Graphical abstract: Effect of Sr substituted La2−xSrxNiO4+δ (x = 0, 0.2, 0.4, 0.6, and 0.8) on oxygen stoichiometry and oxygen transport properties

Article information

Article type
Paper
Submitted
02 Oct 2014
Accepted
26 Nov 2014
First published
28 Nov 2014

RSC Adv., 2015,5, 2486-2492

Author version available

Effect of Sr substituted La2−xSrxNiO4+δ (x = 0, 0.2, 0.4, 0.6, and 0.8) on oxygen stoichiometry and oxygen transport properties

T. Inprasit, S. Wongkasemjit, S. J. Skinner, M. Burriel and P. Limthongkul, RSC Adv., 2015, 5, 2486 DOI: 10.1039/C4RA11672K

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