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Oxygen excess in layered lanthanide nickelates

Buttrey, DJ and Ganguly, P and Honig, JM and Rao, CNR and Schartman, RR and Subbanna, GN (1988) Oxygen excess in layered lanthanide nickelates. In: Journal of Solid State Chemistry, 74 (2). 233 -238.

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Official URL: http://dx.doi.org/10.1016/0022-4596(88)90350-7


Density measurements on large single-crystal specimens of La2NiO4+δ and Pr2NiO4+δ show that oxygen nonstoichiometry arises from the presence of excess lattice oxygen. X-ray photoelectron spectra as well as X-ray absorption edge studies provide no evidence for the existence of Ni3+ in these oxygen-excess nickelates under the conditions of the measurements. Transmission electron microscopy has revealed a novel type of exsolution process of the stoichiometric phase out of nonstoichiometric La2NiO4 during heating in CO2 at 870 K for 3 h. An interpretation of the results in terms of the existence of peroxide species within the conducting layers is proposed.

Item Type: Journal Article
Publication: Journal of Solid State Chemistry
Publisher: Elsevier science
Additional Information: Copyright of this article belongs to Elsevier science.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 25 Sep 2010 06:30
Last Modified: 25 Sep 2010 06:30
URI: http://eprints.iisc.ac.in/id/eprint/32443

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