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Oxygen nonstoichiometry and electrical conductivity of the solid solutions La2−xSrxNiOy (0≤x≤0.5) |
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| Authors: | V V Vashook S P Tolochko I I Yushkevich L V Makhnach I F Kononyuk H Altenburg J Hauck and H Ullmann |
| Institution: | a Institute of General and Inorganic Chemistry, National Academy of Sciences of Belarus, Minsk, Belarus b Fachhochschule Munster, Steinfurt, Germany c Institut fur Festkorperforschung, Forschungszentrum Julich GmbH, Julich, Germany d Technische Universitaet Dresden, Dresden, Germany |
| Abstract: | Oxygen nonstoichiometry and electrical resistance of a series La2−xSrxNiOy solid solutions, where x=0.0, 0.2 and 0.5 in argon flows at oxygen partial pressures 1.5, 10.2, 49.2, 100 and 286 Pa within the temperature range of 20–1050°C were studied. Nickelate oxygen desorption/sorption spectra when heating–cooling at constant rate demonstrated strong dependence of cation composition of the samples. Unlike La1.5Sr0.5NiOy compounds those of La2NiOy and La1.8Sr0.2NiOy have weakly bonded oxygen, capable to exchange reversibly with the gas phase at the temperatures higher than 250°C. The equilibrium values of oxygen nonstoichiometry and specific resistance for the these nickelates were determined at 300–1050°C and pO2=1.5–286 Pa as a functions of temperature versus oxygen partial pressure. All nickelate studied appear to be p-type conductors with metal electric conductivity at equilibrium states. |
| Keywords: | Lanthanum–strontium nickelates Phase transformation Oxygen stoichiometry Electrical conductivity |
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