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

被引：5

作者：

Arevalo-Lopez, Angel M. ^{[1
]}

Huve, Marielle ^{[1
]}

Simon, Pardis ^{[1
]}

Mentre, Olivier ^{[1
]}

机构：

[1] Univ Artois, CNRS, Cent Lille, Univ Lille,ENSCL,UMR 8181,UCCS, F-59000 Lille, France

来源：

CHEMICAL COMMUNICATIONS | 2019年 / 55卷 / 26期

关键词：

BARIUM NICKEL-OXIDE; CRYSTAL-STRUCTURE; PEROVSKITE; FAMILY; PHASE;

D O I：

10.1039/c8cc09610d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 similar to 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.

引用

页码：3717 / 3720

页数：4

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