Determination of isothermal mass and charge transport properties of La2NiO4+δ by ion-blocking cell method

The ionic charge of transport (αi⁎) and partial electronic conductivity under an ion-blocking condition (σ′eσ′e), and chemical diffusivity of oxygen (D˜) of La2NiO4+δ (LNO) is measured as a function of oxygen partial pressure (pO2) at 1000 °C. The defect diffusivity of interstitial oxygen (DiDi) and oxygen self-diffusivity (DODO) are calculated from the data of D˜. The values of Onsager transport coefficients are extracted from the blocking cell data by constructing an Onsager matrix. Various results are compared with the data in literature, which show close agreement.