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.
Oxygen_Excess.pdf - Published Version
Restricted to Registered users only
Download (1556Kb) | Request a copy
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|
|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|
Actions (login required)