Oxygen nonstoichiometry, defect structure and electrical properties of LaFe0.7Ni0.3O3-delta / Kiselev E. A.,Cherepanov V. A. // SOLID STATE IONICS. - 2011. - V. 191, l. 1. - P. 32-39.

ISSN/EISSN:

0167-2738 / 1872-7689

Type:

Article

Abstract:

Oxygen nonstoichiometry (6), total conductivity (a) and thermoelectric power (S) of the LaFe0.7Ni0.3O3-delta 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 degrees C the absolute oxygen content (3 - delta) 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(delta)(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 LaFe0.7Ni0.3O3-delta has been explained by the higher mobility values of electron holes than those of electrons in the whole range of thermodynamic parameters studied. (C) 2011 Elsevier B.V. All rights reserved.

Author keywords:

LaFe0.7Ni0.3O3-delta; Oxygen nonstoichiometry; Conductivity; Thermoelectric power; Electron mobility; Hole mobility OXIDE FUEL-CELLS; PEROVSKITE-TYPE OXIDES; NI-O SYSTEM; LOW-TEMPERATURE; ELECTRONIC-PROPERTIES; LANTHANUM COBALTITES; TRANSPORT-PROPERTIES; CATHODE MATERIAL; SOLID-SOLUTIONS; CONDUCTIVITY

DOI:

10.1016/j.ssi.2011.03.023

Web of Science ID:

ISI:000292357100004

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JUN 2
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
EISSN	1872-7689
Keywords-Plus	OXIDE FUEL-CELLS; PEROVSKITE-TYPE OXIDES; NI-O SYSTEM; LOW-TEMPERATURE; ELECTRONIC-PROPERTIES; LANTHANUM COBALTITES; TRANSPORT-PROPERTIES; CATHODE MATERIAL; SOLID-SOLUTIONS; CONDUCTIVITY
Research-Areas	Chemistry; Physics
Web-of-Science-Categories	Chemistry, Physical; Physics, Condensed Matter
Author-Email	Eugene.Kiselyov@usu.ru
ResearcherID-Numbers	Cherepanov, Vladimir/E-6451-2014
ORCID-Numbers	Cherepanov, Vladimir/0000-0003-3653-6459
Funding-Acknowledgement	Russian Foundation for Basic Research {[}09-03-00620]; Ministry for Education and Science of the Russian Federation
Funding-Text	This work was financially supported in parts by the Russian Foundation for Basic Research (project No. 09-03-00620) and the Ministry for Education and Science of the Russian Federation within the Federal Target Program ``Research and Teaching Stuff of Innovative Russia for 2009-2013{''}.
Number-of-Cited-References	49
Usage-Count-Since-2013	29
Journal-ISO	Solid State Ion.
Doc-Delivery-Number	787DP