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Issue 5, 2016

Oxygen content, cobalt oxide exsolution and defect structure of the double perovskite PrBaCo2O6−δ

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Abstract

Cobalt oxide exsolution as a result of reduction of A-site understoichiometric double perovskite Pr1−xBa1−xCo2O6−γ was found. The reasons for inconsistencies in the experimental data on oxygen content in PrBaCo2O6−δ reported by different authors were discussed. The step-like changes of the oxygen content of PrBaCo2O6−δ with pO2 in the temperature range 1023–1173 K were shown to correspond to reduction of exsolved Co3O4 to CoO. The defect structure analysis of PrBaCo2O6−δ was carried out using the conventional Kröger–Vink approach. The model proposed for the defect structure of PrBaCo2O6−δ was shown to coincide completely with available data on the oxygen content and crystal structure of this double perovskite.

Graphical abstract: Oxygen content, cobalt oxide exsolution and defect structure of the double perovskite PrBaCo2O6−δ

Article information


Submitted
19 Oct 2015
Accepted
08 Jan 2016
First published
11 Jan 2016

J. Mater. Chem. A, 2016,4, 1962-1969
Article type
Paper

Oxygen content, cobalt oxide exsolution and defect structure of the double perovskite PrBaCo2O6−δ

D. S. Tsvetkov, I. L. Ivanov, D. A. Malyshkin and A. Yu. Zuev, J. Mater. Chem. A, 2016, 4, 1962 DOI: 10.1039/C5TA08390G

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