High-temperature transport properties, thermal expansion and cathodic performance of Ni-substituted LaSr2MnO2O7-delta / Yaremchenko A. A.,Bannikov D. O.,Kovalevsky A. V.,Cherepanov V. A.,Kharton V. V. // JOURNAL OF SOLID STATE CHEMISTRY. - 2008. - V. 181, l. 11. - P. 3024-3032.

ISSN/EISSN:

0022-4596 / нет данных

Type:

Article

Abstract:

The substitution of manganese with nickel in LaSr2Mn2O7-delta, where the solubility limit corresponds to approximately 25\% Mn sites, enhances the Ruddlesden-Popper phase stability at elevated temperatures and atmospheric oxygen pressure. The total conductivity of LaSr2Mn2-yNiyO7-delta (y = 0-0.4) decreases with nickel additions, whilst the average thermal expansion coefficients calculated from dilatometric data in the temperature range 300-1370K increase from (11.4-13.7)x K` at y = 0 up to (12.5-14.4) x 10(-6) K-1 at y = 0.4. The conductivity and Seebeck coefficient of LaSr2Mn1.6CNi0.4O7-delta, analyzed in the oxygen partial pressure range 10(-15)-0.3 atm at 600-1270 K, display that the electronic transport is n-type and occurs via a small polaron mechanism. Reductive decomposition is observed at the oxygen pressures close to Ni/NiO boundary, namely similar to 2.3 x 10(-11) atm at 1223 K. Within the phase stability domain, the electronic transport properties are essentially p(O-2)-independent. The steady-state oxygen permeability of dense LaSr2Mn1.6Ni0.4O7-delta membranes is higher than that of(La,Sr)MnO3-delta, but lower if compared to perovskite-like (Sr,Ce)MnO3-delta. Porous LaSr2Mn1.6Ni0.4O7-delta cathodes in contact with apatite-type La10Si5AlO26.5 solid electrolyte exhibit, however, a relatively poor electrochemical performance, partly associated with strong cation interdiffusion between the materials. (C) 2008 Elsevier Inc. All rights reserved.

Author keywords:

Ruddlesden-popper manganite; Mixed conductor; Oxygen permeability; Solid oxide fuel cell cathode; Seebeck coefficient; Thermal expansion MAGNETIC-PROPERTIES; O SYSTEM; ELECTROCHEMICAL-BEHAVIOR; THERMODYNAMIC PROPERTIES; OXYGEN NONSTOICHIOMETRY; PHASE-EQUILIBRIA; OXIDES; CONDUCTIVITY; MAGNETORESISTANCE; STABILITY

DOI:

10.1016/j.jssc.2008.07.038

Web of Science ID:

ISI:000266250200009

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	NOV
Publisher	ACADEMIC PRESS INC ELSEVIER SCIENCE
Address	525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
Language	English
Keywords-Plus	MAGNETIC-PROPERTIES; O SYSTEM; ELECTROCHEMICAL-BEHAVIOR; THERMODYNAMIC PROPERTIES; OXYGEN NONSTOICHIOMETRY; PHASE-EQUILIBRIA; OXIDES; CONDUCTIVITY; MAGNETORESISTANCE; STABILITY
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Inorganic \& Nuclear; Chemistry, Physical
Author-Email	kharton@ua.pt
ResearcherID-Numbers	Yaremchenko, Aleksey/H-2977-2013 Cherepanov, Vladimir/E-6451-2014 Kovalevsky, Andrei/H-3706-2011 Kharton, Vladislav /P-6306-2014
ORCID-Numbers	Yaremchenko, Aleksey/0000-0002-3837-5946 Cherepanov, Vladimir/0000-0003-3653-6459 Kovalevsky, Andrei/0000-0001-5814-9797
Funding-Acknowledgement	FCT, Portugal {[}PTDC/CTM/64357/2006]; Belgian Federal Science Policy foundation
Funding-Text	This work was supported by the FCT, Portugal (Project PTDC/CTM/64357/2006), and by the Belgian Federal Science Policy foundation.
Number-of-Cited-References	40
Usage-Count-Since-2013	23
Journal-ISO	J. Solid State Chem.
Doc-Delivery-Number	448GD