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Issue 26, 2019
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The hidden story in BaNiO3 to BaNiO2 transformation: adaptive structural series and NiO exsolution

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Abstract

BaNiO3 crystal to BaNiO2 crystal transformation is reported. Contrary to an intuitive topochemical reduction, a two step reaction was observed. In the first step, NiO exsolution occurs and intermediate Ba1+xNiO3 phases were obtained and isolated. A composite approach was used to solve the novel structure for x ∼ 1/6 with charge ordered Ni2+ and Ni4+. We argue that this NiO exsolution is responsible for the increased oxygen enhanced reactivity recently reported. Upon re-oxidation, oxygen-deficient mixed valent BaNi3/4+O3−x are obtained such that the full redox cycle is irreversible and goes through a diversity of structural and nickel valence adaptative oxides.

Graphical abstract: The hidden story in BaNiO3 to BaNiO2 transformation: adaptive structural series and NiO exsolution

  • This article is part of the themed collection: Perovskites
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Publication details

The article was received on 03 Dec 2018, accepted on 04 Mar 2019 and first published on 05 Mar 2019


Article type: Communication
DOI: 10.1039/C8CC09610D
Chem. Commun., 2019,55, 3717-3720

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    The hidden story in BaNiO3 to BaNiO2 transformation: adaptive structural series and NiO exsolution

    A. M. Arévalo-López, M. Huvé, P. Simon and O. Mentré, Chem. Commun., 2019, 55, 3717
    DOI: 10.1039/C8CC09610D

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