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Titolo:
Characterization of Nd1-xSrxMnO3 +/-delta SOFC cathode materials
Autore:
Kostogloudis, GC; Ftikos, C;
Indirizzi:
Natlhens, Univ Athens, Dept Chem Engn, Lab Inorgan Mat Technol, GR-15780 At Natl Tech Univ Athens Athens Greece GR-15780 an Mat Technol, GR-15780 At
Titolo Testata:
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
fascicolo: 4, volume: 19, anno: 1999,
pagine: 497 - 505
SICI:
0955-2219(1999)19:4<497:CON+SC>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
OXIDATION-REDUCTION BEHAVIOR; SR-DOPED LAMNO3; DEFECT STRUCTURE; FUEL-CELLS; LANTHANUM MANGANITE; PEROVSKITE; NONSTOICHIOMETRY; OXIDE; STABILITY; TRANSITION;
Keywords:
fuel cells; electrical conductivity; thermal expansion; CeO2;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Kostogloudis, GC NatllytechUniv Athens, Dept Chem Engn, Lab Inorgan Mat Technol, 9 Heroon Po Natl Tech Univ Athens 9 Heroon Polytech St,Zografou Campus Athens Greece GR-15780
Citazione:
G.C. Kostogloudis e C. Ftikos, "Characterization of Nd1-xSrxMnO3 +/-delta SOFC cathode materials", J EUR CERAM, 19(4), 1999, pp. 497-505

Abstract

The crystal structure, thermal expansion behavior and electrical conductivity of Nd1-xSrxMnO3+/-delta (x = 0-0.5) perovskite oxides were investigatedThe chemical compatibility of the compositions with 40 and 50 mol% Sr withGd2O3 doped CeO2 (CGO) electrolyte was also studied. An orthorhombic GdFeO3-type symmetry (space group Pbnm, z=4) was identified for all perovskite oxides, and the lattice parameters were determined. As the level of Sr doping increases, the pseudo-cubic lattice constant decreases, and the thermal expansion coefficient increases. The electrical conductivity can be described by the small polaron hopping conductivity model. The conductivity increases on increasing Sr doping, while the activation energy decreases. The compositions with 40 and 50 mol% Sr show very good thermal expansion and chemical compatibility with CGO electrolyte and can be considered as candidate intermediate temperature solid oxide fuel cell cathode materials. (C) 1999 Elsevier Science Limited All rights reserved.

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Documento generato il 24/09/20 alle ore 11:29:46