Equilibrium of point defects and charge transfer in lanthanum cobaltite / Petrov A.N., Zuev A.Yu., Vylkov A.I., Tsvetkov D.S. // Russian Journal of Physical Chemistry A. - 2006. - V. 80, l. 1 SUPPL.. - P. S128-S133.

ISSN:

00360244

Type:

Article

Abstract:

The specific conductivity logσ T and thermal electromotive force coefficient Q T of perovskite-like lanthanum cobaltite were measured over the temperature range 1173 K ≤ T ≤ 1323 K depending on the partial pressure of oxygen (10-8 atm ≤ p O 2 ≤ 1 atm). The p O 2-T-δ phase diagram of solid LaCoO3-δ studied earlier was used to recalculate the electric property data into the log σ T -δ and Q T -δ dependences. The isoconcentration temperature dependences of specific conductivity (logσ)δ-1/T and Seebeck coefficient Q δ-1/T for LaCoO3-δ were analyzed. The conclusion was drawn that charge transfer was activation in character and had a low activation energy. This was evidence that small-radius polarons (Co Co • and Co Co′) were responsible for charge transfer in perovskite-like lanthanum cobaltite. The calculated equilibrium constants for the formation of electronic defects and functional dependences of defect concentration [Co Co •′] T = f 1(δ) and [Co Co] T = f 2(δ) were used to analyze polaron transfer parameters in LaCoO3-δ. © Nauka/Interperiodica 2006.

Author keywords:

Index keywords:

Charge transfer; Electric conductivity; Partial pressure; Perovskite; Phase equilibria; Point defects; Polarons; Electronic defects; Equilibrium constants; Lanthanum cobaltites; Thermal electromotive

DOI:

10.1134/S003602440613022X

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https://www.scopus.com/inward/record.uri?eid=2-s2.0-33750984203&doi=10.1134%2fS003602440613022X&partnerID=40&md5=90829775c715ecbdf09ce5ac1d6cb8e2

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Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-33750984203&doi=10.1134%2fS003602440613022X&partnerID=40&md5=90829775c715ecbdf09ce5ac1d6cb8e2
Affiliations	Department of Chemistry, Ural State University, pr. Lenina 51, Yekaterinburg, 620083, Russian Federation
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Correspondence Address	Petrov, A.N.; Department of Chemistry, Ural State University, pr. Lenina 51, Yekaterinburg, 620083, Russian Federation; email: alexander.petrov@usu.ru
Language of Original Document	English
Abbreviated Source Title	Russ. J. Phys. Chem. A
Source	Scopus