Chemical Diffusion in Polycrystalline Calcium-Doped Lanthanum Chromites

Oxygen incorporation in porous thin films of strontium doped lanthanum ferrite

“…By fitting the response of the electrical conductivity as a function of time to Eq. 1, D Chem and k Ex can be obtained [15][16][17][18][19][20].…”

Using in situ X-ray absorption spectroscopy to study the local structure and oxygen ion conduction mechanism in (La0.6Sr0.4)(Co0.2Fe0.8)O3−δ

“…The oxygen ion conduction mechanism has been studied using experimental techniques such as isotopic exchange analysis [10,11], transient thermogravimetry (TG) [7,12], coulometric titration [13,14], electrical conductivity [15][16][17], and crystal structure analysis [18,19]. We have previously analyzed the oxygen ion electron conduction mechanism with Rietveld refinements and the maximum entropy method, using synchrotron X-ray and neutron diffraction data [20][21][22].…”

Advanced ceramic interconnect material for solid oxide fuel cells: Electrical and thermal properties of calcium- and nickel-doped yttrium chromites

“…Oxygen ionic leak current leads to an electrochemical consumption of fuel and reduction in the energy conversion efficiency. There have been different approaches to investigate the oxygen permeation through the interconnect materials, including the electrical conductivity relaxation method [42], electron blocking electrode method [43,44], oxygen tracer diffusion method [45,46], and electrochemical method employing zirconia oxygen pump [45,46]. Most of these experiments were performed under a homogeneous or small step of oxygen partial pressure, and the estimation of oxygen permeation flux under the large oxygen chemical potential gradient is controversial [42,43,45].…”

“…There have been different approaches to investigate the oxygen permeation through the interconnect materials, including the electrical conductivity relaxation method [42], electron blocking electrode method [43,44], oxygen tracer diffusion method [45,46], and electrochemical method employing zirconia oxygen pump [45,46]. Most of these experiments were performed under a homogeneous or small step of oxygen partial pressure, and the estimation of oxygen permeation flux under the large oxygen chemical potential gradient is controversial [42,43,45]. In this study, the SOFC operating condition was simulated by exposing one side of a dense Y 0.8 Ca 0.2 Cr 0.85 Ni 0.15 O 3±ı disc to an oxidizing atmosphere (pO 2 = 0.21 atm) and the other side to a reducing atmosphere (pO 2 = ∼10 −20 atm).…”