Defect structure and oxide ion transport in Sr- and Cr-doped LaCoO3 (-) (delta) / Zuev A. Yu.,Vylkov A. I.,Tsvetkov D. S. // SOLID STATE IONICS. - 2011. - V. 192, l. 1, SI. - P. 220-224.

ISSN/EISSN:

0167-2738 / 1872-7689

Type:

Article; Proceedings Paper

Abstract:

The results of oxygen nonstoichiometry, delta, measured by means of coulometric technique as a function of oxygen partial pressure, P-o2, in temperature range 1223 <= T, K <= 1323 are presented for the perovskite-type doped with chromium solely LaCo0.7Cr0.3O3 (-) (delta) and simultaneously doped both with strontium and chromium La0.7Sr0.3Co0.7Cr0.3O3 (- delta) cobaltites. The limit stability of the latter was found to exceed that of undoped cobaltite LaCoO3 (- delta) on six orders of magnitude of p(o2) 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 La0.7Sr0.3Co0.7Cr0.3O3 (- delta) as a function of oxygen partial pressure p(o2) and temperature in the ranges -4 <= log(p(o2), atm) <= 0 and 1223 <= T, K <= 1323, respectively. The additional substitution of Sr for La in LaCo0.7Cr0.3O3 (- delta) 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 La0.7Sr0.3Co0.7Cr0.3O3 (-) (delta) were found to be dependent on oxygen partial pressure and nonstoichiometry unlike undoped and doped with chromium lanthanum cobaltites. (C) 2010 Elsevier B.V. All rights reserved.

Author keywords:

Lanthanum cobaltite; Polarization; Oxygen chemical diffusion coefficient; Oxygen ionic conductivity; Self-diffusion coefficient LANTHANUM COBALTITES; CHARGE-TRANSFER; CONDUCTIVITY; STABILITY

DOI:

10.1016/j.ssi.2010.05.049

Web of Science ID:

ISI:000292848800049

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JUN 16
Note	17th International Conference on Solid State Ionics, Toronto, CANADA, JUN 28-JUL 03, 2009
Organization	Int Soc Solid State Lonics
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
EISSN	1872-7689
Keywords-Plus	LANTHANUM COBALTITES; CHARGE-TRANSFER; CONDUCTIVITY; STABILITY
Research-Areas	Chemistry; Physics
Web-of-Science-Categories	Chemistry, Physical; Physics, Condensed Matter
Author-Email	andrew.zuev@usu.ru
ResearcherID-Numbers	Zuev, Andrey/E-6220-2014 Vylkov, Aleksey/M-7433-2013 Tsvetkov, Dmitry/N-2491-2016
ORCID-Numbers	Vylkov, Aleksey/0000-0003-3988-1311
Number-of-Cited-References	20
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	34
Journal-ISO	Solid State Ion.
Doc-Delivery-Number	793UG