The oxygen nonstoichiometry and defect structure of unsubstituted LaCoO3-delta 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/EISSN:

0036-0244 / нет данных

Type:

Article

Abstract:

paper presents the results obtained in studying the oxygen nonstoichiometry of undoped lanthanum cobaltite LaCoO3-delta 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-delta. The conclusion was drawn that these data were insufficient for selecting the most realistic model of the defect structure of this compound.

Author keywords:

LANTHANUM COBALTITE; MAGNETIC-PROPERTIES

DOI:

10.1134/S0036024407010141

Web of Science ID:

ISI:000253704800014

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JAN
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
Keywords-Plus	LANTHANUM COBALTITE; MAGNETIC-PROPERTIES
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Physical
Author-Email	andrew.zuev@usu.ru
ResearcherID-Numbers	Vylkov, Aleksey/M-7433-2013 Tsvetkov, Dmitry/N-2491-2016 Zuev, Andrey/E-6220-2014
ORCID-Numbers	Vylkov, Aleksey/0000-0003-3988-1311
Number-of-Cited-References	16
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	14
Journal-ISO	Russ. J. Phys. Chem. A
Doc-Delivery-Number	270FA