TY - JOUR
T1 - Chemical diffusion and surface exchange in selected Ln-Ba-Sr-Co-Fe perovskite-type oxides
AU - Zheng, K.
AU - Klimkowicz, A.
AU - ͆wierczek, K.
AU - Malik, A.
AU - Ariga, Y.
AU - Tominaga, T.
AU - Takasaki, A.
N1 - Funding Information:
The project was funded by the National Science Centre Poland (NCN) on the basis of the decision number DEC-2012/05/E/ST5/03772 .
Funding Information:
The authors (A.K., K.Ś., Y.A., A.T.) acknowledge financial support from JSPS-PAN Joint Research Project “Development of IGFU System with Oxygen and Hydrogen Storage Units”.
Publisher Copyright:
© 2014 Elsevier B.V.
Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 2015/8/11
Y1 - 2015/8/11
N2 - Abstract In this paper, a discussion on determination of chemical diffusion coefficient (D) and surface exchange reaction coefficient (K) was given on a basis of electrical conductivity and mass relaxation experiments, performed for selected Ln-Ba-Sr-Co-Fe perovskite-type oxides. The synthesized materials were analyzed in terms of their basic physicochemical properties (crystal structure, oxygen nonstoichiometry, electrical conductivity). Gathered relaxation-type data were critically analyzed, and a strong effect of the enthalpy of the oxidation process, as well as an influence of the porosity were observed, showing limitations of applicability of these techniques, especially for simultaneous determination of D and K. An additional discussion and results were also given regarding possibility of using X-ray diffraction data, recorded during change of the oxygen partial pressure at elevated temperatures, for evaluation of the considered transport coefficients.
AB - Abstract In this paper, a discussion on determination of chemical diffusion coefficient (D) and surface exchange reaction coefficient (K) was given on a basis of electrical conductivity and mass relaxation experiments, performed for selected Ln-Ba-Sr-Co-Fe perovskite-type oxides. The synthesized materials were analyzed in terms of their basic physicochemical properties (crystal structure, oxygen nonstoichiometry, electrical conductivity). Gathered relaxation-type data were critically analyzed, and a strong effect of the enthalpy of the oxidation process, as well as an influence of the porosity were observed, showing limitations of applicability of these techniques, especially for simultaneous determination of D and K. An additional discussion and results were also given regarding possibility of using X-ray diffraction data, recorded during change of the oxygen partial pressure at elevated temperatures, for evaluation of the considered transport coefficients.
KW - Electrical conductivity relaxation technique
KW - Mass relaxation technique
KW - Perovskite oxides
KW - Transport properties
KW - X-ray diffraction
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U2 - 10.1016/j.jallcom.2014.12.110
DO - 10.1016/j.jallcom.2014.12.110
M3 - Article
AN - SCOPUS:84938951793
VL - 645
SP - S357-S360
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
IS - S1
M1 - 32843
ER -