Chemical diffusion and oxygen exchange of LaNi0.4Fe0.6O3-δ ceramics

Jianying CHEN; Vladimir VASHOOK; Dmytro M. TROTS; Shaorong WANG; Ulrich GUTH

doi:10.1007/s40145-014-0116-y

Journal of Advanced Ceramics 2014, 3(3): 240-249 https://doi.org/10.1007/s40145-014-0116-y

Research Article |

Open Access | Issue | Published: 02 September 2014

Chemical diffusion and oxygen exchange of LaNi_0.4Fe_0.6O_3-δ ceramics

Show Author's Information Hide Author's Information Jianying CHEN^{^a^,^b^,^e}(

), Vladimir VASHOOK^{^b}, Dmytro M. TROTS^{^c}, Shaorong WANG^{^a}, Ulrich GUTH^{^b^,^d}

^a Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China

^b Dresden University of Technology, D-01062 Dresden, Germany

^c Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany

^d Meinsberg Kurt-Schwabe Research Institute, Kurt-Schwabe-Straße 4, D-04720 Ziegra-Knobelsdorf, Germany

^e Shanghai Nanotechnology Promotion Center, Shanghai, China

Keywords:

conductivity, oxygen non-stoichiometry, chemical diffusion coefficient, surface exchange coefficient

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CHEN J, VASHOOK V, TROTS DM, et al. Chemical diffusion and oxygen exchange of LaNi_0.4Fe_0.6O_3-δ ceramics. Journal of Advanced Ceramics, 2014, 3(3): 240-249. https://doi.org/10.1007/s40145-014-0116-y

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Abstract

Oxygen surface exchange and oxygen chemical diffusion coefficients of LaNi_0.4Fe_0.6O_3-δ ceramics are determined via conductivity relaxation method after stepwise change of temperature in the range of 700–950 ℃ in air and Ar/O₂ gas flow at oxygen partial pressures ( $p_{O_{2}}$ ) of 4 Pa, 18 Pa, 37 Pa, 47 Pa and 59 Pa. The highest conductivity (about 160 S·cm^-1) is found at 950 ℃ in air. No oxygen exchange (δ = 0) below 700 ℃ is observed in the investigated $p_{O_{2}}$ range. The oxygen exchange coefficients determined in reduction mode are higher than those determined in oxidation mode. This is explained by clusterization of oxygen vacancies on the surface of the sample investigated in oxidation mode. The opposite tendency is found for chemical diffusion coefficients. Unlike surface, the oxygen vacancies of the volume region are probably not clustered and have predetermined the higher oxygen diffusion mobility of the sample treated in oxidation mode.

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Chemical diffusion and oxygen exchange of LaNi_0.4Fe_0.6O_3-δ ceramics

Show Author's information Hide Author's Information Jianying CHEN^{^a^,^b^,^e}(

), Vladimir VASHOOK^{^b}, Dmytro M. TROTS^{^c}, Shaorong WANG^{^a}, Ulrich GUTH^{^b^,^d}

^a Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China

^b Dresden University of Technology, D-01062 Dresden, Germany

^c Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany

^d Meinsberg Kurt-Schwabe Research Institute, Kurt-Schwabe-Straße 4, D-04720 Ziegra-Knobelsdorf, Germany

^e Shanghai Nanotechnology Promotion Center, Shanghai, China

Abstract

Keywords: conductivity, oxygen non-stoichiometry, chemical diffusion coefficient, surface exchange coefficient

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Acknowledgements

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Publication history

Received: 09 April 2014

Revised: 19 June 2014

Accepted: 22 June 2014

Published: 02 September 2014

Issue date: September 2014

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Acknowledgements

The authors gratefully acknowledge the financial support of the European Union, the Government of Saxony, Germany (SAB Project 14252) and HASYLAB/DESY for X-ray diffraction measurements with synchrotron radiation (Project I-20090287).

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Open Access: This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.