publication . Other literature type . Article . 2013

Phase equilibria, crystal structure and oxygen content of intermediate phases in the Y–Ba–Co–O system

Vladimir A. Cherepanov; E.A. Kiselev; A.S. Urusova; L. Ya. Gavrilova; T.V. Aksenova;
Open Access
  • Published: 01 Jun 2013
  • Publisher: Elsevier BV
  • Country: Russian Federation
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, YBaCo₄O₇ and BaCo1–yYyO3–δ (0.09≤y≤0.42). It was shown that YBaCo₂O5+δ possesses tetragonal structure with the 3aₚ×3aₚ×2aₚ superstructure (sp. gr. P4/mmm). High-temperature X-ray diffraction analysis of the YBaCo₂O5+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 l...
Subjects
free text keywords: CRYSTAL STRUCTURE, OXYGEN CONTENT, PHASE DIAGRAM, SYNTHESIS, THERMAL EXPANSION, HIGH TEMPERATURE X-RAY DIFFRACTION, INTERMEDIATE PHASIS, LINEAR CHARACTERISTICS, OXYGEN NON-STOICHIOMETRY, TETRAGONAL STRUCTURE, THERMAL EXPANSION COEFFICIENTS, UNIT CELL PARAMETERS, OXYGEN, PHASE DIAGRAMS, PHASE EQUILIBRIA, SOLID SOLUTIONS, SYNTHESIS (CHEMICAL), THERMOELECTRICITY, X RAY DIFFRACTION ANALYSIS, BARIUM COMPOUNDS, Physical and Theoretical Chemistry, Inorganic Chemistry, Materials Chemistry, Electronic, Optical and Magnetic Materials, Condensed Matter Physics, Ceramics and Composites, Atmospheric temperature range, Chemistry, Tetragonal crystal system, Isothermal process, Solid solution, Physical chemistry, X-ray crystallography, Analytical chemistry
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