Oxide ion transport in undoped and Cr-doped LaCoO3-delta / 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/EISSN:

0167-2738 / нет данных

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 p(O2), and temperature in the ranges -4 <= log(p(O2), atm) <= 0 and 900 <= T, degrees C <= 1050, respectively, are presented for the perovskite-type undoped LaCoO3-delta and doped with chromium LaCo0.7Cr0.3O3-delta 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 p(O2) 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. (c) 2007 Elsevier B.V. All rights reserved.

Author keywords:

lanthanum cobaltite; polarization; oxygen chemical diffusion coefficient; oxygen ionic conductivity; self-diffusion coefficient PEROVSKITE-TYPE OXIDES; LA-CO-O; LANTHANUM COBALTITES; DEFECT STRUCTURE; CONDUCTIVITY; NONSTOICHIOMETRY; SYSTEM

DOI:

10.1016/j.ssi.2007.08.005

Web of Science ID:

ISI:000251539600006

Соавторы в МНС:

Другие поля

Поле	Значение
Month	OCT
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
Keywords-Plus	PEROVSKITE-TYPE OXIDES; LA-CO-O; LANTHANUM COBALTITES; DEFECT STRUCTURE; CONDUCTIVITY; NONSTOICHIOMETRY; SYSTEM
Research-Areas	Chemistry; Physics
Web-of-Science-Categories	Chemistry, Physical; Physics, Condensed Matter
Author-Email	andrew.zuev@usu.ru
ResearcherID-Numbers	Tsvetkov, Dmitry/N-2491-2016 Zuev, Andrey/E-6220-2014 Vylkov, Aleksey/M-7433-2013
ORCID-Numbers	Vylkov, Aleksey/0000-0003-3988-1311
Number-of-Cited-References	29
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	24
Journal-ISO	Solid State Ion.
Doc-Delivery-Number	239TC