Nonstoichiometry, thermal expansion and oxygen permeability of SmBaCo2-xCuxO6-delta / Volkova N. E.,Kolotygin V. A.,Gavrilova L. Ya.,Kharton V. V.,Cherepanov V. A. // SOLID STATE IONICS. - 2014. - V. 260, l. . - P. 15-20.

ISSN/EISSN:

0167-2738 / 1872-7689

Type:

Article

Abstract:

Phase relationship analysis in the pseudobinary SmBaCo2 - xCuxO6 - delta system at 1000-1100 degrees C in air revealed the existence of solid solutions with the layered perovskite and 123-type structures, formed within the ranges of 0 <= x <1.2 and 1.5 <= x <= 2.0, respectively. The substitution of Cu2+ for Co3+/4+ was found to induce phase transition from orthorhombic (space group Pmmm) into tetragonal (P4/mmm) polymorph at x > 0.1, and to increase oxygen deficiency studied by thermogravimetry and iodometric titration. The electrical conductivity and thermal expansion of Cu-substituted cobaltites decrease on doping, while the steady-state Oxygen permeability exhibits an opposite trend, in correlation with the oxygen content variations. The average thermal expansion coefficient of SmBaCo1.4Cu0.6O6 - delta ceramics, where the level of ionic transport is comparable to that in most permeable cobaltite-based mixed conductors, is 16.9 x 10(-6) K-1 at 25-1000 degrees C in air. At the same time, copper additions increase chemical reactivity of the materials with doped ceria electrolytes. (C) 2014 Elsevier B.V. All rights reserved.

Author keywords:

Samarium-barium cobaltite; Dilatometry; Oxygen deficiency; Oxygen permeation; Electronic conductivity OXIDE FUEL-CELLS; CRYSTAL-STRUCTURE; ELECTROCHEMICAL PROPERTIES; CERAMIC MICROSTRUCTURE; TRANSPORT-PROPERTIES; CATHODE MATERIAL; IONIC TRANSPORT; MEMBRANES; TEMPERATURE; LNBACO(2)O(5+DELTA)

DOI:

10.1016/j.ssi.2014.03.003

Web of Science ID:

ISI:000336697700004

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JUL 1
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
EISSN	1872-7689
Keywords-Plus	OXIDE FUEL-CELLS; CRYSTAL-STRUCTURE; ELECTROCHEMICAL PROPERTIES; CERAMIC MICROSTRUCTURE; TRANSPORT-PROPERTIES; CATHODE MATERIAL; IONIC TRANSPORT; MEMBRANES; TEMPERATURE; LNBACO(2)O(5+DELTA)
Research-Areas	Chemistry; Physics
Web-of-Science-Categories	Chemistry, Physical; Physics, Condensed Matter
ResearcherID-Numbers	Cherepanov, Vladimir/E-6451-2014 Kharton, Vladislav /P-6306-2014
ORCID-Numbers	Cherepanov, Vladimir/0000-0003-3653-6459
Funding-Acknowledgement	Russian Foundation for Basic Research {[}13-03-00958\_a, 13-03-12409]; Ministry of Education and Science of the Russian Federation {[}14.B25.31.0018]; FCT, Portugal
Funding-Text	This work was financially supported by the Russian Foundation for Basic Research (project nos. 13-03-00958\_a and 13-03-12409), the Ministry of Education and Science of the Russian Federation (project 14.B25.31.0018), and the FCT, Portugal.
Number-of-Cited-References	30
Usage-Count-Last-180-days	3
Usage-Count-Since-2013	36
Journal-ISO	Solid State Ion.
Doc-Delivery-Number	AI2OL