Influence of annealing at intermediate temperature on oxygen transport kinetics of Pr2NiO4+: δ

Saim Saher, Jia Song, Vaibhav Vibhu, Clément Nicollet, Aurélien Flura, Jean Marc Bassat, Henny J.M. Bouwmeester (Corresponding Author)

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Electrical conductivity relaxation (ECR) and oxygen permeation measurements were conducted, at 750 °C, to assess the long-term oxygen transport characteristics of the mixed ionic-electronic conducting Pr2NiO4+δ with a K2NiF4 structure. The results show that the apparent values for the oxygen diffusion and surface exchange coefficients extracted from the data and the associated oxygen flux increase over 120 h by 1-2 orders of magnitude. The results of post-mortem X-ray diffraction analysis of the samples show partial to virtually complete decomposition of Pr2NiO4+δ under the conditions of the experiments to Pr4Ni3O10+δ, PrNiO3-δ, Pr6O11, and traces of NiO. Pulse 18O-16O isotopic exchange (PIE) measurements confirmed fast surface exchange kinetics of the higher-order Ruddlesden-Popper phase Pr4Ni3O10+δ and Pr6O11 formed upon decomposition. Additional factors related to the microstructure, however, need to be considered to explain the observations.

Original languageEnglish
Pages (from-to)8331-8339
Number of pages9
JournalJournal of Materials Chemistry A
Volume6
Issue number18
DOIs
Publication statusPublished - 1 Jan 2018

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Annealing
Oxygen
Kinetics
Decomposition
Temperature
Permeation
X ray diffraction analysis
Fluxes
Microstructure
Experiments
Electric Conductivity

Cite this

Saher, Saim ; Song, Jia ; Vibhu, Vaibhav ; Nicollet, Clément ; Flura, Aurélien ; Bassat, Jean Marc ; Bouwmeester, Henny J.M. / Influence of annealing at intermediate temperature on oxygen transport kinetics of Pr2NiO4+: δ. In: Journal of Materials Chemistry A. 2018 ; Vol. 6, No. 18. pp. 8331-8339.
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Influence of annealing at intermediate temperature on oxygen transport kinetics of Pr2NiO4+: δ. / Saher, Saim; Song, Jia; Vibhu, Vaibhav; Nicollet, Clément; Flura, Aurélien; Bassat, Jean Marc; Bouwmeester, Henny J.M. (Corresponding Author).

In: Journal of Materials Chemistry A, Vol. 6, No. 18, 01.01.2018, p. 8331-8339.

Research output: Contribution to journalArticleAcademicpeer-review

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