Impact of La doping on the crystalline phase and mixed ionic-electronic conductivities of Ba0.5−xLa0.5+xFeO3−δ (0≤x≤0.3) solid solution

Alam, Md. Saiful; Kagomiya, Isao; Kakimoto, Ken‐ichi

doi:10.1007/s10854-022-09729-x

Cited by 4 publications

(5 citation statements)

References 38 publications

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“…19 Our previous study concerning synchrotron XRPD and literature also suggest a single phase formation. 20,21 The Rietveld refinement pattern of our previous synchrotron XRPD 9 and the normal XRPD data (in this study) further assures the phase purity with cubic perovskite structure and Pm-3m phase of this sample, Fig. 3b.…”

Section: Resultssupporting

confidence: 75%

“…Ba-Fe based perovskite is a possible candidate of SOFCs as Co/ Sr free MEIC with high oxygen permeability, 8 we also observed that Ba 0.5 La 0.5 FeO 3¹¤ (BLF55), 9 which is free from Co and Sr, has high oxygen permeability (0.25 µmol/cm 2 /s) at 950 °C, comparable to that of La 0.65 Ca 0.35 FeO 3¹¤ (LCaF) (0.27 µmol/cm 2 /s). 10 Thus, in comparison to La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3¹¤ (LSCF), 10 the BLF55 may have a high/comparable potential for the cathode of SOFCs, OPMs, etc.…”

Section: Introductionmentioning

confidence: 61%

“…The high relative density (>95 %) and dense morphology of the prepared sample were also confirmed in our previous study of this sample. 9 The homogeneous distribution of the atoms of the prepared sample was studied through EDX. To confirm the compositional homogeneity, EDX was performed on both the sample surface and cross-section.…”

Section: Resultsmentioning

confidence: 99%

“…The surface EDX profile of this composition was reported in our earlier study. 9 Figure 4 shows the EDX mapping layout of both surface and cross-section. The patterns look like almost similar and suggest the homogeneous distribution of compositional atoms on both surface and sample depth.…”

Section: Resultsmentioning

confidence: 99%

“…In addition to the citric acid, ethylene glycol was used as a fuel and complexant agent. The sample preparation process in this investigation was the same as the previous preparation of this BLF55 sample 9 and our recent work. 13 The obtained mixed solution was heated with a pyrex glass flasks to obtain a dark-red color gel at 100 °C.…”

Section: Experimental Partmentioning

confidence: 99%

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Evaluating the Rate-determining Steps of Oxygen Permeation in Ba0.5La0.5FeO3−δ Perovskite

2023

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Perovskite oxides obtained from Ba 1−x La x FeO 3−δ (BLF) are considered beneficial materials for electrodes of solid oxide fuel cells and oxygen permeation membranes because of their high oxygen permeability, which is a criterion of oxide ion (O 2− )-electronic mixed conductivity. In this paper, the prime focus was to understand the oxygen permeation mechanism through surface exchange and bulk diffusion of the Ba 0.5 -La 0.5 FeO 3−δ (BLF55) sample. The permeated oxygen flux displayed higher than that of the typical mixed conductor La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ (LSCF), which was explored simultaneously with corresponding oxygen chemical potentials employing an especial experimental setup. This study found that the surface exchange reaction on the oxygen-lean side was the rate-determining step (RDS) of the oxygen permeation below 800 °C, resulting from lower hole concentration on the oxygen-lean side surface. Enhancing the charge transfer from the surface oxygen by increasing hole concentration is a prime important strategy to improve the surface exchange reaction.

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