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dc.contributor.authorKharton, VV-
dc.contributor.authorKovalevsky, AV-
dc.contributor.authorAvdeev, M-
dc.contributor.authorTsipis, EV-
dc.contributor.authorPatrakeev, MV-
dc.contributor.authorYaremchenko, AA-
dc.contributor.authorNaumovich, EN-
dc.contributor.authorFrade, JR-
dc.identifier.citationKharton, V. V., Kovalevsky, A. V., Avdeev, M., Tsipis, E. V., Patrakeev, M. V., Yaremchenko, A. A., Naumovich, E. N., & Frade, J. R. (2007). Chemically induced expansion of La2NiO4+ δ-based materials. Chemistry of Materials 19, 8, 2027–2033. doi:10.1021/cm070096xen_US
dc.description.abstractThe equilibrium chemical strains induced by the oxygen hyperstoichiometry variations in mixed-conducting La2Ni1-xMxO4+δ (M = Fe, Co, Cu; x = 0−0.2) with K2NiF4-type structure, were studied by controlled-atmosphere dilatometry at 923−1223 K in the oxygen partial pressure range 5 × 10-4 to 0.7 atm. In combination with the oxygen content measured by coulometric titration and thermogravimetry, the results reveal a very low chemical expansivity, favorable for high-temperature electrochemical applications. Under oxidizing conditions, the isothermal expansion relative to atmospheric oxygen pressure (εC) is less than 0.02%. The ratio between these values and the corresponding nonstoichiometry increment varies from −3 × 10-3 to 6 × 10-3, which is much lower compared to most permeable mixed conductors derived from perovskite-like cobaltites and ferrites. Consequently, the chemical contribution to apparent thermal expansion coefficients at a fixed oxygen pressure, (13.7−15.1) × 10-6 K-1, does not exceed 5%. The high-temperature X-ray diffraction studies showed that this behavior results from strongly anisotropic expansion of the K2NiF4-type lattice, namely the opposing variations of the unit-cell parameters on changing oxygen stoichiometry. © 2007, American Chemical Societyen_US
dc.publisherAmerican Chemical Societyen_US
dc.subjectThermal gravimetric analysisen_US
dc.subjectThermal expansionen_US
dc.titleChemically induced expansion of La2NiO4+ δ-based materialsen_US
dc.typeJournal Articleen_US
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