Buttrey, D. J. ; Ganguly, P. ; Honig, J. M. ; Rao, C. N. R. ; Schartman, R. R. ; Subbanna, G. N. (1988) Oxygen excess in layered lanthanide nickelates Journal of Solid State Chemistry, 74 (2). pp. 233-238. ISSN 0022-4596
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/002245...
Related URL: http://dx.doi.org/10.1016/0022-4596(88)90350-7
Abstract
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: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 13772 |
| Deposited On: | 12 Nov 2010 14:45 |
| Last Modified: | 31 May 2011 09:53 |
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