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|Title:||Phase equilibria, crystal structure and oxygen content of intermediate phases in the Y-Ba-Co-O system|
|Authors:||Urusova, A. S.|
Cherepanov, V. A.
Aksenova, T. V.
Gavrilova, L. Y.
Kiselev, E. A.
|Citation:||Phase equilibria, crystal structure and oxygen content of intermediate phases in the Y-Ba-Co-O system / A. S. Urusova, V. A. Cherepanov, T. V. Aksenova [et al.] // Journal of Solid State Chemistry. — 2013. — Vol. 202. — P. 207-214.|
|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.|
HIGH TEMPERATURE X-RAY DIFFRACTION
THERMAL EXPANSION COEFFICIENTS
UNIT CELL PARAMETERS
X RAY DIFFRACTION ANALYSIS
|Appears in Collections:||Научные публикации, проиндексированные в SCOPUS и WoS CC|
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