Chemically induced expansion of La2NiO4+ δ-based materials

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dc.contributor.authorKharton, VVen_AU
dc.contributor.authorKovalevsky, AVen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorTsipis, EVen_AU
dc.contributor.authorPatrakeev, MVen_AU
dc.contributor.authorYaremchenko, AAen_AU
dc.contributor.authorNaumovich, ENen_AU
dc.contributor.authorFrade, JRen_AU
dc.date.accessioned2020-11-03T03:28:54Zen_AU
dc.date.available2020-11-03T03:28:54Zen_AU
dc.date.issued2007-03-21en_AU
dc.date.statistics2020-11-02en_AU
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_AU
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_AU
dc.identifier.issn1520-5002en_AU
dc.identifier.issue8en_AU
dc.identifier.journaltitleChemistry of Materialsen_AU
dc.identifier.pagination2027-2033en_AU
dc.identifier.urihttps://doi.org/10.1021/cm070096xen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/9954en_AU
dc.identifier.volume19en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectOxidesen_AU
dc.subjectMembranesen_AU
dc.subjectOxygenen_AU
dc.subjectCeramicsen_AU
dc.subjectStoichiometryen_AU
dc.subjectElectrochemistryen_AU
dc.subjectThermal gravimetric analysisen_AU
dc.subjectThermal expansionen_AU
dc.titleChemically induced expansion of La2NiO4+ δ-based materialsen_AU
dc.typeJournal Articleen_AU
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