Stability and oxygen transport properties of Pr2NiO4+delta ceramics
authors Kovalevsky, AV; Kharton, VV; Yaremchenko, AA; Pivak, YV; Naumovich, EN; Frade, JR
nationality International
journal JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
author keywords ionic conductivity; thermal expansion; perovskites; membranes; praseodymium nickelate
keywords HIGH-TEMPERATURE; OXIDES; MEMBRANES; LA; CU
abstract The oxygen permeability and stability of dense Pr2NiO4+delta ceramics have been appraised in comparison with KNiF4-type lanthanum nickelate. In oxidizing atmospheres, Pr2NiO4+delta exhibit an extensive oxygen uptake and decomposition into the Ruddlesden-Popper-type Pr4Ni3O10 and praseodymium oxide at temperatures below 900 degrees C. At 900-950 degrees C when the K2NiF4-type praseodymium nickelate is stable in the ceramic membranes placed under an oxygen partial pressure gradient, the steady-state oxygen permeability of Pr2NiO4+delta is similar to La2NiO4+delta. The phase changes on cooling lead to considerably higher oxygen permeability, which becomes comparable to that of perovskite-type cobaltites, and to noticeable isothermal expansion. The stability of Pr2NiO4+delta in reducing atmospheres, estimated from the P(02) dependencies of total conductivity and Seebeck coefficient, is lower than that of LaNiO4+delta, probably due to a smaller size of the A-site cation. (c) 2007 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0955-2219
year published 2007
volume 27
issue 13-15
beginning page 4269
ending page 4272
digital object identifier (doi) 10.1016/j.jeurceramsoc.2007.02.136
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000248822800148
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journal impact factor 3.794
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