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/EISSN:

0036-0244 / 1531-863X

Type:

Article

Abstract:

The oxygen nonstoichiometry of nickel- and iron-substituted lanthanum cobaltites of the compositions LaCo1-xNixO3-delta (x = 0.1, 0.3) and LaCo0.9Fe0.1O3-delta 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 p(O2)= f (delta) 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.

Author keywords:

PEROVSKITE-TYPE OXIDES; PHYSICOCHEMICAL PROPERTIES; LACOO3; CONDUCTIVITY; LAFEO3; NI

DOI:

10.1134/S0036024407120084

Web of Science ID:

ISI:000253706800008

Соавторы в МНС:

Другие поля

Поле	Значение
Month	DEC
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
EISSN	1531-863X
Keywords-Plus	PEROVSKITE-TYPE OXIDES; PHYSICOCHEMICAL PROPERTIES; LACOO3; CONDUCTIVITY; LAFEO3; NI
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Physical
Author-Email	evgenykiselev@e1.ru
ResearcherID-Numbers	Proskurnina, Natalia/J-8145-2013 Cherepanov, Vladimir/E-6451-2014
ORCID-Numbers	Proskurnina, Natalia/0000-0001-5423-6180 Cherepanov, Vladimir/0000-0003-3653-6459
Number-of-Cited-References	21
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	19
Journal-ISO	Russ. J. Phys. Chem. A
Doc-Delivery-Number	270FT