Transport properties and defect analysis of La1.9Sr0.1NiO4 + δ |
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| Authors: | Zuoan Li Reidar Haugsrud Jens B Smith Truls Norby |
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| Institution: | aDepartment of Chemistry, University of Oslo, Centre for Materials Science and Nanotechnology, FERMiO, Gaustadalleen 21, NO-0349 Oslo, Norway;bStatoilHydro Research Centre Porsgrunn, Forskningsparken, NO-3908 Porsgrunn, Norway |
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| Abstract: | The oxygen flux through La1.9Sr0.1NiO4 + δ has been measured as a function of oxygen activity gradient and temperature (750–1000 °C). The oxygen nonstoichiometry was determined by thermogravimetry in the temperature range of 400–1000 °C and oxygen partial pressures of 0.0002–1 atm. The total conductivity was measured over a similar range of conditions. The oxide ion partial conductivity derived from the oxygen flux data is approximately 4 orders of magnitude lower than the total, mainly p-type electronic conductivity. The defect structure was derived based on the data. Combining the oxygen flux and oxygen nonstoichiometry, the self diffusion coefficient of oxygen interstitials was evaluated. |
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| Keywords: | Oxygen diffusion Oxygen nonstoichiometry Defect chemistry La2NiO4 + δ La1 9Sr0 1NiO4 + δ |
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