Phase equilibria, crystal structure and oxygen content of intermediate phases in the Y-Ba-Co-O system / Urusova A. S.,Cherepanov V. A.,Aksenova T. V.,Gavrilova L. Ya,Kiselev E. A. // JOURNAL OF SOLID STATE CHEMISTRY. - 2013. - V. 202, l. . - P. 207-214.

ISSN/EISSN:

0022-4596 / нет данных

Type:

Article

Abstract:

The phase equilibria in the Y-Ba-Co-O system were systematically studied at 1373 K in air. The intermediate phases formed in the Y-Ba-Co-O system at 1373 K in air were: YBaCo2O5+delta, YBaCO4O7 and BaCo1-yYyO3-delta (0.09 <= y <= 0.42). It was shown that YBaCo2O5+delta possesses tetragonal structure with the 3a(p) x 3a(p) x 20(p) superstructure (sp. gr. P4/mmm). High-temperature X-ray diffraction analysis of the YBaCo2O5+delta in the temperature range from 298 K up to 1073 K under Po-2=0.21 atm has not shown any phase transformations. The value of oxygen content for the YBaCo2O5+delta at room temperature was estimated as 5.40 and at 1323 K it was equal to 5.04. Thermal expansion of sample shows a linear characteristics and the average thermal expansion coefficient (TEC) is about 13.8 x 10(-6), K-1 in the temperature range 298-1273 K. The homogeneity range and crystal structure of the BaCo1-yYyO3-delta (0.09 <= y <= 0.42) solid solutions were determined by X-ray diffraction of quenched samples. All Ba-Co1-yYyO3-delta solid solutions were found to have cubic structure (sp. gr. Pm3m). The unit cell parameters were refined using Rietveld full-profile analysis. Oxygen nonstoichiometry of BaCo1-yYyO3-delta solid solutions with 0.1 <= y <= 0.4 was measured by means of thermogravimetric technique within the temperature range 298-1373 K in air. Thermal expansion of BaCo1-yYyO3-delta (y=0.0; 0.1; 0.2; 0.3) samples was studied within the temperature range 298-1200 K in air. The projection of isothermal-isobaric phase diagram for the Y-Ba-Co-O system to the compositional triangle of metallic components was presented. (C) 2013 Elsevier Inc. All rights reserved.

Author keywords:

Synthesis; Crystal structure; Oxygen content; Thermal expansion; Phase diagram OXIDE FUEL-CELLS; PHYSICAL-PROPERTIES; PEROVSKITE; NONSTOICHIOMETRY; YBACO4O7+DELTA; COBALTITES; SPIN; LNBACO(2)O(5+DELTA); YBACO2O5+DELTA; CAPABILITY

DOI:

10.1016/j.jssc.2013.03.037

Web of Science ID:

ISI:000319845300032

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JUN
Publisher	ACADEMIC PRESS INC ELSEVIER SCIENCE
Address	525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
Language	English
Keywords-Plus	OXIDE FUEL-CELLS; PHYSICAL-PROPERTIES; PEROVSKITE; NONSTOICHIOMETRY; YBACO4O7+DELTA; COBALTITES; SPIN; LNBACO(2)O(5+DELTA); YBACO2O5+DELTA; CAPABILITY
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Inorganic \& Nuclear; Chemistry, Physical
Author-Email	vladimir.cherepanov@usu.ru
ResearcherID-Numbers	Cherepanov, Vladimir/E-6451-2014
ORCID-Numbers	Cherepanov, Vladimir/0000-0003-3653-6459
Funding-Acknowledgement	Russian Foundation for Basic Research {[}12-03-91663-ERA\_a]; 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. 12-03-91663-ERA\_a) and the Ministry for Education and Science of the Russian Federation within the Federal Target Program ``Investigations and researchers on the priority directions of development for the scientific and technological complex of Russia in 2007-2013{''}.
Number-of-Cited-References	30
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	36
Journal-ISO	J. Solid State Chem.
Doc-Delivery-Number	156SX