Oxygen vacancy formation and defect structure of Cu-doped lanthanum chromite LaCr0.79Cu0.05Al0.16O3-delta / Zuev A,Singheiser L,Hilpert K // SOLID STATE IONICS. - 2005. - V. 176, l. 3-4. - P. 417-421.

ISSN/EISSN:

0167-2738 / нет данных

Type:

Article

Abstract:

The results of oxygen nonstoichiometry are presented for the chromite LaCr0.79Cu0.05Al0.16O3-delta with hexagonal perovskite structure at 1000 degreesC. The modeling of the defect structure of this oxygen deficient chromite is carried out by considering also the acceptor dopant Cu on B-site. The equilibrium constants, necessary to calculate all a priori unknown equilibrium defect concentrations, are determined by fitting the derived model equation to the measured oxygen nonstoichiometry. The three oxidation states 3+, 2+, and 1+ for copper are considered simultaneously in Cu-doped lanthanum chromite in addition to 3+ and 4+ states for chromium in the host lattice. The results of the fitting revealed that there is no significant change of the Cr3+ oxidation state over the complete oxygen partial pressure range investigated (-20less than or equal tolog(p(O2)/atm)less than or equal to0). In contrast to this, copper changes its oxidation state continuously from 3+ via 2+ to 1+ if the oxygen partial pressure decreases thereby giving rise to oxygen vacancy formation. (C) 2004 Elsevier B.V. All rights reserved.

Author keywords:

copper-doped lanthanum chromite; oxygen nonstoichiometry; modeling of the defect structure FUEL-CELLS; LACRO3; EXPANSION

DOI:

10.1016/j.ssi.2004.08.003

Web of Science ID:

ISI:000226872700025

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	JAN 31
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
Keywords-Plus	FUEL-CELLS; LACRO3; EXPANSION
Research-Areas	Chemistry; Physics
Web-of-Science-Categories	Chemistry, Physical; Physics, Condensed Matter
Author-Email	a.zuev@fz-juelich.de
ResearcherID-Numbers	Zuev, Andrey/E-6220-2014
Number-of-Cited-References	9
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	8
Journal-ISO	Solid State Ion.
Doc-Delivery-Number	895OM