Defect structure and oxide ion transport in Sr- and Cr-doped LaCoO 3 - δ / Zuev A.Yu., Vylkov A.I., Tsvetkov D.S. // Solid State Ionics. - 2011. - V. 192, l. 1. - P. 220-224.

ISSN:

01672738

Type:

Conference Paper

Abstract:

The results of oxygen nonstoichiometry, δ, measured by means of coulometric technique as a function of oxygen partial pressure, po2, in temperature range 1223 ≤ T, K ≤ 1323 are presented for the perovskite-type doped with chromium solely LaCo0.7Cr 0.3O3 - δ and simultaneously doped both with strontium and chromium La0.7Sr0.3Co0.7Cr 0.3O3 - δ cobaltites. The limit stability of the latter was found to exceed that of undoped cobaltite LaCoO3 - δ on six orders of magnitude of po2 at a given temperature. The modeling of the defect structure of these perovskites was carried out and its adequate model was found. Chemical and self-diffusion coefficients of oxygen vacancies and oxygen ionic conductivity and ionic transport numbers were measured for the first time for La0.7Sr0.3Co 0.7Cr0.3O3 - δ as a function of oxygen partial pressure po2and temperature in the ranges - 4 ≤ log(po2, atm) ≤ 0 and 1223 ≤ T, K ≤ 1323, respectively. The additional substitution of Sr for La in LaCo0.7Cr0.3O 3 - δ was shown to lead to noticeable increase of ionic conductivity and oxygen chemical diffusion coefficient at given values of oxygen partial pressure and temperature as compared to lanthanum cobaltite doped with chromium solely. Self-diffusion coefficient of oxygen vacancies and their mobility in La0.7Sr0.3Co0.7Cr 0.3O3 - δ were found to be dependent on oxygen partial pressure and nonstoichiometry unlike undoped and doped with chromium lanthanum cobaltites. © 2010 Elsevier B.V. All rights reserved.

Author keywords:

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

Index keywords:

Adequate models; Chemical diffusion coefficients; Cr-doped; Ionic transport numbers; Lanthanum cobaltite; Non-stoichiometry; Orders of magnitude; Oxide ions; Oxygen ionic conductivity; Oxygen non-stoi

DOI:

10.1016/j.ssi.2010.05.049

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https://www.scopus.com/inward/record.uri?eid=2-s2.0-79958786600&doi=10.1016%2fj.ssi.2010.05.049&partnerID=40&md5=78df75a97146186a3fef30993b140eba

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Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-79958786600&doi=10.1016%2fj.ssi.2010.05.049&partnerID=40&md5=78df75a97146186a3fef30993b140eba
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