Transport properties and stability of Ni-containing mixed conductors with perovskite- and K2NiF4-type structure
authors Kharton, VV; Yaremchenko, AA; Shaula, AL; Patrakeev, MV; Naumovich, EN; Loginovich, DI; Frade, JR; Marques, FMB
nationality International
journal JOURNAL OF SOLID STATE CHEMISTRY
author keywords lanthanum nickelate; perovskite; K2NiF4-type structure; phase stability; total conductivity; Seebeck coefficient; mixed conductor; electron-hole transport; oxygen permeability
keywords OXYGEN NONSTOICHIOMETRY; CRYSTAL-CHEMISTRY; ION-TRANSPORT; PHASE-DIAGRAM; CONDUCTIVITY; LA2NIO4+DELTA; TEMPERATURE; SYSTEM; TRANSITION; OXIDES
abstract The total conductivity and Seebeck coefficient of a series of Ni-containing phases, including La2Ni1-xMxO4+sigma (M = Co, Cu; x = 0.1-0.2) with K2NiF4-type structure and perovskite-like La(0.90)Sr(0.65)Gao(0.65)Mg(0.15)Ni(0.20)O(3-delta) and La0.50Pr0.50Ga0.65Mg0.15 Ni0.20O3-delta, were studied in the oxygen partial pressure range from 10(-18) Pa to 50 kPa at 973-1223 K. Within the phase stability domain, the conductivity of layered nickelates is predominantly p-type electronic and occurs via small-polaron mechanism, indicated by temperature-activated hole mobility and p(O-2) dependencies of electrical properties. In oxidizing conditions similar behavior is characteristic of Ni-containing perovskites, which exhibit, however, significant ionic contribution to the transport processes. The role of ionic conduction increases with decreasing P(O-2) and becomes dominant in reducing atmospheres. All nickelate-based phases decompose at oxygen pressures considerably lower with respect to Ni/NiO boundary. The partial substitution of nickel in La2Ni(M)O4+delta has minor effect on the stability limits, which are similar to that of La0.90Sr0.10 Ga0.65Mg0.15Ni0.20O3-delta. On the contrary, praseodymium doping enhances the stability of La0.50Pr0.50Ga0.65Mg0.15Ni0.20O3-delta down to p(O-2) values as low as 10(-17)-10(-10) Pa at 1023-1223 K. (C) 2003 Elsevier Inc. All rights reserved.
publisher ACADEMIC PRESS INC ELSEVIER SCIENCE
issn 0022-4596
year published 2004
volume 177
issue 1
beginning page 26
ending page 37
digital object identifier (doi) 10.1016/S0022-4596(03)00261-5
web of science category Chemistry, Inorganic & Nuclear; Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000188534800004
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