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Modulated Structure of La2NiO4+δas a Mechanism of Oxygen Excess Accommodation

Authors
Journal
Journal of Solid State Chemistry
0022-4596
Publisher
Elsevier
Publication Date
Volume
125
Issue
2
Identifiers
DOI: 10.1006/jssc.1996.0275

Abstract

Abstract A microstructural characterization by means of high resolution transmission electron microscopy has been performed in La 2NiO 4+δin order to confirm the distribution of the oxygen excess. A structure commensurately modulated along [010] with modulation period a S= 3 a, and another with b S= 4 balong [100] were found. The origin of such modulations is discussed in terms of the irregular distribution of interstitial oxygen atoms within the crystal lattice. Although the structural changes may be electron beam induced and these new phases are minorities and possibly metastable, the results contribute new information about how the interstitial oxygen can be accommodated.

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