Defect structure and charge transfer in undoped and doped lanthanum cobaltites / Petrov A. N.,Zuev A. Yu.,Vylkov A. I.,Tsvetkov D. S. // JOURNAL OF MATERIALS SCIENCE. - 2007. - V. 42, l. 6. - P. 1909-1914.

ISSN/EISSN:

0022-2461 / нет данных

Type:

Article; Proceedings Paper

Abstract:

The results of electronic conductivity and Seebeck coefficient are presented for perovskite-type undoped cobaltite LaCoO(3-delta), doped with strontium La(0.7)Sr(0.3)CoO(3-delta), and doped with copper LaCo(0.7) Cu(0.3)O(3-delta). The electronic conductivity and the Seebeck coefficient were studied as a function of pO(2) in the range 10(-6)<= pO(2)/atm <= 1 at temperatures between 1073 and 1323 K. The charge transfer mechanism in the oxides studied is revealed within the framework of localized charge carriers approach on the basis of the defect structure modeling. LaCoO(3-delta) and La(0.7)Sr(0.3) CoO(3-delta) are shown to be the typical small polaron hopping conductors with p-type small polarons at Co sites, Co(Co)(center dot), as major carriers and n-type small polarons, Co(Co)(center dot), as minor carriers in the temperature range investigated. The charge transfer in copperdoped cobaltite LaCo(0.7)Cu(0.3)O(3-delta) seems to be carried out by means both hopping of n-type small polarons, Cu(Co)(/) and Co(Co)(/), at copper and cobalt sites, respectively, and p-type small polarons at Co sites. The mobilities and nonconfigurational entropies of charge transfer are determined for all types of charge carriers.

Author keywords:

ELECTRICAL-PROPERTIES; CONDUCTIVITY; LACOO3; OXIDE; TRANSITION; MODEL

DOI:

10.1007/s10853-006-0346-7

Web of Science ID:

ISI:000244889600007

Соавторы в МНС:

Другие поля

Поле	Значение
Month	MAR
Note	International Conference on Nonstoichiometric Compounds, Kauai, HI, APR 03-08, 2005
Organization	Engn Conf Int
Publisher	SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013 USA
Language	English
Keywords-Plus	ELECTRICAL-PROPERTIES; CONDUCTIVITY; LACOO3; OXIDE; TRANSITION; MODEL
Research-Areas	Materials Science
Web-of-Science-Categories	Materials Science, Multidisciplinary
Author-Email	andrew.zuev@usu.ru
ResearcherID-Numbers	Tsvetkov, Dmitry/N-2491-2016 Vylkov, Aleksey/M-7433-2013 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	20
Journal-ISO	J. Mater. Sci.
Doc-Delivery-Number	145UA