Abstract
La2 – x Ce x NiO y and Sr2 – x Ce x NiO y materials were prepared, and their properties were studied. Nearly single-phase Sr2 – x Ce x NiO y samples (tetragonal K2NiF4 structure) could be obtained at x= 0.25 and 0.3. The lattice parameters, weight change, relative length change, and electrical resistivity of Sr1.7Ce0.3NiO y were measured from 20 to 1000°C. The oxygen content of this material, determined by hydrogen reduction and iodometric titration, was found to vary widely, depending on heat-treatment conditions. The room-temperature resistivity of Sr1.7Ce0.3NiO y is (2–5) × 10–2 Ω cm. In the range 20–450°C, this material exhibits n-type conductivity. Its thermoelectric power varies from –12 μV/K at 20°C to –34 μV/K at 450°C. The temperature variation of resistivity for Sr1.7Ce0.3NiO4 in the first heating–cooling cycle below 450°C is shown to depend on the thermal history of the sample. The resistivity reaches a maximum between 500 and 800°C. The structural and transport properties of the mixed oxide are shown to be correlated with its oxygen content.
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Makhnach, L.V., Tolochko, S.P., Vashuk, V.V. et al. Synthesis and Physicochemical Properties of La–Ce–Ni–O and Sr–Ce–Ni–O Oxides. Inorganic Materials 38, 1258–1263 (2002). https://doi.org/10.1023/A:1021375405311
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DOI: https://doi.org/10.1023/A:1021375405311