Oxygen nonstoichiometry, defect structure and electrical properties of LaFe0.7Ni0.3O3-δ / Kiselev E.A., Cherepanov V.A. // Solid State Ionics. - 2011. - V. 191, l. 1. - P. 32-39.

ISSN:

01672738

Type:

Article

Abstract:

Oxygen nonstoichiometry (δ), total conductivity (σ) and thermoelectric power (S) of the LaFe0.7Ni0.3O 3 - δ sample have been studied as functions of temperature and oxygen partial pressure. Based on the results of the direct reduction of the sample in hydrogen flow at 1100 °C the absolute oxygen content (3 - δ) has been found to vary from 2.999 to 2.974 in the range of 1273-1373 K and 10- 3-0.21 atm. The point defect equilibrium models have been proposed and fitted to the set of experimental data in the form of log p(O 2) = f(δ)T dependences. The values of standard thermodynamic quantities of defect formation reactions have been assessed. The joint analysis of oxygen nonstoichiometry, total conductivity and thermoelectric power has been performed using a small-polaron approach. The values of partial conductivity, partial thermopower and mobilities of electronic charge carriers have been calculated. The p-type semiconducting behavior of LaFe 0.7Ni0.3O3 - δ has been explained by the higher mobility values of electron holes than those of electrons in the whole range of thermodynamic parameters studied. © 2011 Elsevier B.V.

Author keywords:

Conductivity; Electron mobility; Hole mobility; LaFe0.7Ni0.3O3 - δ; Oxygen nonstoichiometry; Thermoelectric power

Index keywords:

Conductivity; Defect formation; Direct Reduction; Electrical property; Electron hole; Electronic charges; Experimental data; Hydrogen flow; Joint analysis; Mobility value; Oxygen content; Oxygen nonst

DOI:

10.1016/j.ssi.2011.03.023

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https://www.scopus.com/inward/record.uri?eid=2-s2.0-79956116115&doi=10.1016%2fj.ssi.2011.03.023&partnerID=40&md5=0bf53fc2d62dd9a2427fa632c51ebe40

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Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-79956116115&doi=10.1016%2fj.ssi.2011.03.023&partnerID=40&md5=0bf53fc2d62dd9a2427fa632c51ebe40
Affiliations	Department of Chemistry, Ural State University, Lenin Av. 51, 620000 Ekaterinburg, Russian Federation
Author Keywords	Conductivity; Electron mobility; Hole mobility; LaFe0.7Ni0.3O3 - δ; Oxygen nonstoichiometry; Thermoelectric power
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Correspondence Address	Kiselev, E. A.; Department of Chemistry, Ural State University, Lenin Av. 51, 620000 Ekaterinburg, Russian Federation; email: Eugene.Kiselyov@usu.ru
CODEN	SSIOD
Language of Original Document	English
Abbreviated Source Title	Solid State Ionics
Source	Scopus