Oxygen nonstoichiometry, defect structure, thermal and chemical expansion of pseudo-cubic La0.8Sr0.2Co0.9Ni0.1O3-δ and double perovskite GdBaCo2O6-δ / Zuev A.Yu., Sereda V.V., Tsvetkov D.S. // Journal of the Electrochemical Society. - 2014. - V. 161, l. 11. - P. F3032-F3038.

ISSN:

00134651

Type:

Article

Abstract:

The results of thermal and chemical expansion measured as a function of oxygen partial pressure, pO2, and temperature by meansof in situ XRD and dilatometric techniques are presented for the pseudo-cubic cobaltite La0.8Sr0.2Co0.9Ni0.1O3-δ and the double perovskite GdBaCo2O6-δ. The modeling of the defect structure of La0.8Sr0.2Co0.9Ni0.1O3-δ was carried out. Within the framework of the model all nickel sites are assumed to be occupied by localized electrons whereas both electrons and holes can be localized on cobalt sites. The defect structure model proposedwas shown to fit pretty well available experimental data on oxygen nonstoichiometry of the perovskite studied. Concentrations of all defect species were calculated and then employed to compute the chemical expansion of the La0.8Sr0.2Co0.9Ni0.1O3-δ lattice as a function of its oxygen nonstoichiometry. Cobalt ions transition from low spin (LS) state to high spin (HS) one induced by temperature increase was taken into account as well. The model proposed was shown to coincide completely with experimental data on chemical expansion for the La0.8Sr0.2Co0.9Ni0.1O3-δ at all temperatures investigated. As a result, the spin state distribution of cobalt was calculated depending on temperature for the oxide studied. Double perovskite latticechemical expansion along a axis and contraction along c axis with decreasing oxygen content, 6-δ, were found to compensate each other completely and, therefore, volume chemical expansion becomes negligible. As a result the cell volume linearly increases with temperature contrary to the simple pseudo-cubic perovskite. © 2014 The Electrochemical Society.

Author keywords:

Index keywords:

Cobalt; Defect structures; Defects; Expansion; Hydraulic structures; Lanthanum; Lanthanum compounds; Nickel; Oxygen; Perovskite; Chemical expansion; Dilatometric techniques; Double perovskites; Electr

DOI:

10.1149/2.0061411jes

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https://www.scopus.com/inward/record.uri?eid=2-s2.0-84923545050&doi=10.1149%2f2.0061411jes&partnerID=40&md5=5375f9dd1411b6fdd1ec8117d619e440

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Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-84923545050&doi=10.1149%2f2.0061411jes&partnerID=40&md5=5375f9dd1411b6fdd1ec8117d619e440
Affiliations	Institute of Natural Sciences, Ural Federal University, Ekaterinburg, Russian Federation
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Correspondence Address	Zuev, A.Yu.; Institute of Natural Sciences, Ural Federal UniversityRussian Federation
Publisher	Electrochemical Society Inc.
CODEN	JESOA
Language of Original Document	English
Abbreviated Source Title	J Electrochem Soc
Source	Scopus