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.Y., Kiselev E.A. // Journal of Solid State Chemistry. - 2013. - V. 202, l. . - P. 207-214.

ISSN:

00224596

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+δ, YBaCo4O 7 and BaCo1-yYyO3-δ (0.09≤y≤0.42). It was shown that YBaCo2O5+δ possesses tetragonal structure with the 3ap×3a p×2ap superstructure (sp. gr. P4/mmm). High-temperature X-ray diffraction analysis of the YBaCo2O 5+δ in the temperature range from 298 K up to 1073 K under Po2=0.21 atm has not shown any phase transformations. The value of oxygen content for the YBaCo2O5+δ 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 13.8×10-6, K-1 in the temperature range 298-1273 K. The homogeneity range and crystal structure of the BaCo1-yYyO3-δ (0.09≤y≤0.42) solid solutions were determined by X-ray diffraction of quenched samples. All BaCo1-yYyO3-δ 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 BaCo 1-yYyO3-δ 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 BaCo 1-yYyO3-δ (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. © 2013 Elsevier Inc.

Author keywords:

Crystal structure; Oxygen content; Phase diagram; Synthesis; Thermal expansion

Index keywords:

High temperature X-ray diffraction; Intermediate phasis; Linear characteristics; Oxygen content; Oxygen non-stoichiometry; Tetragonal structure; Thermal expansion coefficients; Unit cell parameters; C

DOI:

10.1016/j.jssc.2013.03.037

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https://www.scopus.com/inward/record.uri?eid=2-s2.0-84878033626&doi=10.1016%2fj.jssc.2013.03.037&partnerID=40&md5=a5fb6a1a25f30c1e6b9fc2c059f51072

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Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-84878033626&doi=10.1016%2fj.jssc.2013.03.037&partnerID=40&md5=a5fb6a1a25f30c1e6b9fc2c059f51072
Affiliations	Department of Chemistry, Institute of Natural Sciences, Ural Federal University, Yekaterinburg, Russian Federation
Author Keywords	Crystal structure; Oxygen content; Phase diagram; Synthesis; Thermal expansion
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Correspondence Address	Cherepanov, V.A.; Department of Chemistry, Institute of Natural Sciences, Ural Federal University, Yekaterinburg, Russian Federation; email: vladimir.cherepanov@usu.ru
CODEN	JSSCB
Language of Original Document	English
Abbreviated Source Title	J. Solid State Chem.
Source	Scopus