Abstract
In this work, effect of doping of a fixed-valence non-transition metal ion Al3+ on B-site of La2NiO4+δ (LNO) system is investigated by a blocking cell experiment. The mass and charge transport properties of La2Ni0.95Al0.05O4.025+δ (LNAO) in isothermal conditions are investigated and ionic charge of transport (α*i), which is a measure of cross-effect between ionic and electronic flows and corresponds to the number of electrons dragged by a cation in the absence of the direct cause of electron flow, and partial electronic conductivity under a blocking condition is measured and values of Onsager transport coefficients are extracted by constructing an Onsager matrix. α*i shows a minimum during its variation with oxygen partial pressure (pO2) which might be related to the unusual defect structure of LNO systems. Oxygen chemical diffusivities as a function of pO2 at different temperatures are extracted from Onsager coefficients to calculate defect diffusivity of interstitial oxygen (Di) and oxygen self-diffusivity(DO). Di values for LNAO are nearly 2 orders of magnitude lower than those for LNO, which might be due to the reduction in free-volume of perovskite layer on Al3+ doping. Partial ionic conductivity (σi) and oxygen permeation flux are calculated from Onsager coefficients, and values are compared with LNO.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
