Oxygen nonstoichiometry and defect structure of undoped and doped lanthanum cobaltites / Zuev A.Yu., Petrov A.N., Vylkov A.I., Tsvetkov D.S. // Journal of Materials Science. - 2007. - V. 42, l. 6. - P. 1901-1908.

ISSN:

00222461

Type:

Conference Paper

Abstract:

The results of oxygen nonstoichiometry are presented for the perovskite-type undoped cobaltite LaCoO3-δ, doped with strontium La0.7Sr0.3CoO3-δ, and doped with copper LaCo0.7Cu0.3O3-δ as a function of oxygen partial pressure pO2 and temperature. The modeling of the defect structure of these oxygen deficient perovskites is carried out. Two different defect structure models are evolved. Within the framework of the first model electrons are treated as quasi-free in LaCoO3-δ, partly trapped in La0.7Sr0.3CoO3-δ and LaCo0.7Cu0.3O3-δ, whereas holes are assumed to be itinerant in all oxides studied. The intrinsic electronic disordering process is taken into account as well. According to the second model electrons and holes are assumed to be localized. Thermal excited charge disproportionation of cobalt is considered as well. The corresponding equations for the law of mass action, electroneutrality condition, and mass balance give a set of nonlinear equations in the both cases. The analytical solutions of these sets yield general expressions which are used for the verification of the defect models proposed by nonlinear curve fitting. The latter showed that both models of the defect structure of all lanthanum cobaltites studied fit the experimental data about equally good. It is, therefore, difficult to rule out either of defect structure models on the basis of equilibrium data on oxygen nonstoichiometry solely. © Springer Science+Business Media, LLC 2007.

Author keywords:

Index keywords:

Curve fitting; Defect structures; Hole traps; Lanthanum compounds; Nonlinear equations; Perovskite; Stoichiometry; Defect models; Nonlinear curve fitting; Nonstoichiometry; Second model electrons; Dop

DOI:

10.1007/s10853-006-0345-8

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https://www.scopus.com/inward/record.uri?eid=2-s2.0-33947118319&doi=10.1007%2fs10853-006-0345-8&partnerID=40&md5=3142b8f4fa40c427b63820e0b0c8da71

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Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-33947118319&doi=10.1007%2fs10853-006-0345-8&partnerID=40&md5=3142b8f4fa40c427b63820e0b0c8da71
Affiliations	Chemical Department, Ural State University, Lenin Av.51, Yekaterinburg 620083, Russian Federation
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Correspondence Address	Zuev, A.Yu.; Chemical Department, Ural State University, Lenin Av.51, Yekaterinburg 620083, Russian Federation; email: andrew.zuev@usu.ru
CODEN	JMTSA
Language of Original Document	English
Abbreviated Source Title	J Mater Sci
Source	Scopus