Oxide ion transport in undoped and Cr-doped LaCoO3-δ / Tsvetkov D.S., Zuev A.Yu., Vylkov A.I., Petrov A.N. // Solid State Ionics. - 2007. - V. 178, l. 25-26. - P. 1458-1462.

ISSN:

01672738

Type:

Article

Abstract:

The results of chemical and self-diffusion coefficient of oxygen vacancies, oxygen ionic conductivity and ionic transport numbers measured as a function of oxygen partial pressure pO2 and temperature in the ranges - 4 ≤ log(pO2, atm) ≤ 0 and 900 ≤ T, °C ≤ 1050, respectively, are presented for the perovskite-type undoped LaCoO3-δ and doped with chromium LaCo0.7Cr0.3O3-δ cobaltites. The dependencies of these properties on oxygen partial pressures were shown to have monotonic character. This can, therefore, indicate that defect clusters or associates containing oxygen vacancies do not form in the oxides over complete pO2 range investigated. The predominant charge carriers in both undoped and Cr-doped lanthanum cobaltite are electron defects, since oxygen vacancies transport numbers do not exceed 2 · 10-3%. The substitution of Cr for Co was found to lead to decrease of both ionic conductivity and oxygen chemical diffusion coefficient. Activation energy of ionic conductivity of the oxides studied decreases with the oxygen nonstoichiometry increase. Self-diffusion coefficient of oxygen vacancies and their mobility were shown to be independent of oxygen partial pressure and nonstoichiometry most likely due to lack of the defects interaction in the oxide studied. © 2007 Elsevier B.V. All rights reserved.

Author keywords:

Lanthanum cobaltite; Oxygen chemical diffusion coefficient; Oxygen ionic conductivity; Polarization; Self-diffusion coefficient

Index keywords:

Charge transfer; Diffusion; Doping (additives); Ionic conductivity; Oxygen vacancies; Lanthanum cobaltite; Oxygen chemical diffusion coefficients; Oxygen ionic conductivity; Self-diffusion coefficient

DOI:

10.1016/j.ssi.2007.08.005

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https://www.scopus.com/inward/record.uri?eid=2-s2.0-35449000446&doi=10.1016%2fj.ssi.2007.08.005&partnerID=40&md5=6787419026264153214a2ec184cea222

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Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-35449000446&doi=10.1016%2fj.ssi.2007.08.005&partnerID=40&md5=6787419026264153214a2ec184cea222
Affiliations	Department of Chemistry, Ural State University, Lenin av.51, 620083 Yekaterinburg, Russian Federation
Author Keywords	Lanthanum cobaltite; Oxygen chemical diffusion coefficient; Oxygen ionic conductivity; Polarization; Self-diffusion coefficient
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Correspondence Address	Zuev, A.Yu.; Department of Chemistry, Ural State University, Lenin av.51, 620083 Yekaterinburg, Russian Federation; email: andrew.zuev@usu.ru
CODEN	SSIOD
Language of Original Document	English
Abbreviated Source Title	Solid State Ionics
Source	Scopus