The oxygen nonstoichiometry and defect structure of unsubstituted LaCoO3-δ cobaltite / Zuev A.Yu., Petrov A.N., Vylkov A.I., Tsvetkov D.S. // Russian Journal of Physical Chemistry A. - 2007. - V. 81, l. 1. - P. 73-77.

ISSN:

00360244

Type:

Article

Abstract:

The paper presents the results obtained in studying the oxygen nonstoichiometry of undoped lanthanum cobaltite LaCoO3-δ as a function of temperature and oxygen pressure. A model analysis of the defect structure of the compound was performed. Two models were considered. For the first model, it was assumed that electrons and electron holes were quasi-free, whereas, in the second model, they were considered localized on cobalt ions. The internal electronic disordering and thermally excited disproportionation of cobalt were also taken into consideration in the first and second models, respectively. For both models, systems of nonlinear equations comprising the corresponding mass action law, mass balance, and electroneutrality equations were constructed. Verification equations were obtained for both models by solving these systems. The correspondence of the suggested models to experimental data was checked by the nonlinear regression method. Both models almost equally correctly described the data on the oxygen nonstoichiometry of LaCoO3-δ. The conclusion was drawn that these data were insufficient for selecting the most realistic model of the defect structure of this compound. © Nauka/Interperiodica 2007.

Author keywords:

Index keywords:

Data reduction; Electronic properties; Mathematical models; Molecular structure; Nonlinear systems; Regression analysis; Cobalt ions; Defect structure; Nonstoichiometry; Lanthanum compounds

DOI:

10.1134/S0036024407010141

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https://www.scopus.com/inward/record.uri?eid=2-s2.0-33846173016&doi=10.1134%2fS0036024407010141&partnerID=40&md5=d21717bcc944c58b23e0fe68bf9156e5

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Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-33846173016&doi=10.1134%2fS0036024407010141&partnerID=40&md5=d21717bcc944c58b23e0fe68bf9156e5
Affiliations	Ural State University, pr. Lenina 51, Yekaterinburg, 620083, Russian Federation
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Correspondence Address	Zuev, A.Yu.; Ural State University, pr. Lenina 51, Yekaterinburg, 620083, Russian Federation; email: andrew.zuev@usu.ru
Language of Original Document	English
Abbreviated Source Title	Russ. J. Phys. Chem. A
Source	Scopus