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:

00222461

Type:

Conference Paper

Abstract:

The results of electronic conductivity and Seebeck coefficient are presented for perovskite-type undoped cobaltite LaCoO3-δ, doped with strontium La0.7Sr0.3CoO3-δ, and doped with copper LaCo0.7Cu0.3O3-δ. The electronic conductivity and the Seebeck coefficient were studied as a function of pO2 in the range 10-6≤pO2/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-δ and La0.7Sr0.3CoO3-δ are shown to be the typical small polaron hopping conductors with p-type small polarons at Co sites, Cȯ Co, as major carriers and n-type small polarons, Co Co / , as minor carriers in the temperature range investigated. The charge transfer in copper-doped cobaltite LaCo 0.7Cu0.3O3-δ 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. © Springer Science+Business Media, LLC 2007.

Author keywords:

Index keywords:

Charge transfer; Defect structures; Electric conductivity; Lanthanum compounds; Perovskite; Seebeck coefficient; Defect structure modeling; Lanthanum cobaltites; Localized charge carriers; Polaron hop

DOI:

10.1007/s10853-006-0346-7

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https://www.scopus.com/inward/record.uri?eid=2-s2.0-33947095132&doi=10.1007%2fs10853-006-0346-7&partnerID=40&md5=eebd0147a6ea95ad4438400b2628184c

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Поле	Значение
Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-33947095132&doi=10.1007%2fs10853-006-0346-7&partnerID=40&md5=eebd0147a6ea95ad4438400b2628184c
Affiliations	Chemical Department, Ural State University, Lenin Av. 51, 620083 Yekaterinburg, Russian Federation
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Correspondence Address	Zuev, A.Yu.; Chemical Department, Ural State University, Lenin Av. 51, 620083 Yekaterinburg, Russian Federation; email: andrew.zuev@usu.ru
CODEN	JMTSA
Language of Original Document	English
Abbreviated Source Title	J Mater Sci
Source	Scopus