Issue 26, 2019

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

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

Supplementary files

Article information

Article type
Communication
Submitted
03 Tsh 2018
Accepted
04 Ube 2019
First published
05 Ube 2019

Chem. Commun., 2019,55, 3717-3720

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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