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)

*Corresponding author for this work

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7 Citations (Scopus)

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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