Chemical diffusion and surface exchange in selected Ln-Ba-Sr-Co-Fe perovskite-type oxides

K. Zheng, Alicja Klimkowicz, K. ͆wierczek, A. Malik, Y. Ariga, T. Tominaga, Akito Takasaki

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Abstract

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.

Original languageEnglish
Article number32843
Pages (from-to)S357-S360
JournalJournal of Alloys and Compounds
Volume645
Issue numberS1
DOIs
Publication statusPublished - 2015 Aug 11

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Keywords

  • Electrical conductivity relaxation technique
  • Mass relaxation technique
  • Perovskite oxides
  • Transport properties
  • X-ray diffraction

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys

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