The oxygen nonstoichiometry, defect structure, and thermodynamic characteristics of disordering of nickel-and iron-substituted lanthanum cobaltites / Kiselev E.A., Proskurnina N.V., Cherepanov V.A. // Russian Journal of Physical Chemistry A. - 2007. - V. 81, l. 12. - P. 1950-1955.

ISSN:

00360244

Type:

Article

Abstract:

The oxygen nonstoichiometry of nickel-and iron-substituted lanthanum cobaltites of the compositions LaCo1-x Ni x O 3-δ (x = 0.1, 0.3) and LaCo0.9Fe0.1O 3-δ was studied by high-temperature thermogravimetric analysis over the temperature and oxygen partial pressure ranges 1223-1473 K and 10 -3-0.21 atm. The partial replacement of cobalt with nickel (an acceptor impurity) in lanthanum cobaltite was found to increase the number of defects in the oxygen sublattice, whereas the replacement with iron (a donor impurity) decreased this number. Correlations between the experimental log pO2 = f(δ ) dependences and the suggested models of formation of point defects were analyzed taking into account the formation of Schottky defects. Interrelation between the defect structure, partial molar thermodynamic characteristics of oxygen release from the crystal lattices of the oxides studied, and the nature of substituting impurities (Ni and Fe) in lanthanum cobaltite was demonstrated. © 2007 Pleiades Publishing, Ltd.

Author keywords:

Index keywords:

Defect structures; Lanthanum compounds; Oxygen; Partial pressure; Stoichiometry; Thermodynamic properties; Thermogravimetric analysis; Disordering; Oxygen sublattice; Thermodynamic characteristics; Ni

DOI:

10.1134/S0036024407120084

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https://www.scopus.com/inward/record.uri?eid=2-s2.0-36949036653&doi=10.1134%2fS0036024407120084&partnerID=40&md5=fcfa7e1abd0d817b136dbacacf5ffa0c

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Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-36949036653&doi=10.1134%2fS0036024407120084&partnerID=40&md5=fcfa7e1abd0d817b136dbacacf5ffa0c
Affiliations	Ural State University, pr. Lenina 51, Yekaterinburg 620083, Russian Federation
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Correspondence Address	Kiselev, E.A.; Ural State University, pr. Lenina 51, Yekaterinburg 620083, Russian Federation; email: evgenykiselev@e1.ru
Language of Original Document	English
Abbreviated Source Title	Russ. J. Phys. Chem. A
Source	Scopus