Preparation, crystal structure and properties of HoBaCo{sub 2−x}Fe{sub x}O{sub 5+δ}
- Ural Federal University, Yekaterinburg (Russian Federation)
Highlights: ► Synthesis of HoBaCo{sub 2−x}Fe{sub x}O{sub 5+δ} by glycerin nitrate technique in air and in pure oxygen. ► Substitution of Co by Fe influences both the value of oxygen content and crystal structure. ► The changes of oxygen content were measured by TGA. - Abstract: A series of samples of overall composition HoBaCo{sub 2−x}Fe{sub x}O{sub 5+δ} with 0.0 ≤ x ≤ 0.8 were prepared by glycerin nitrate technique in air and in pure oxygen. Irrespective of atmosphere used the homogeneity range of single phase iron substituted holmium barium cobaltate was proved to exist within the range 0.0 ≤ x ≤ 0.4. All samples prepared in air and samples within the compositional range 0.2 ≤ x ≤ 0.4 obtained in oxygen possess tetragonal a{sub p} × a{sub p} × 2a{sub p} (sp. gr. P4/mmm) structure. HoBaCo{sub 2}O{sub 5+δ} and HoBaCo{sub 1.9}Fe{sub 0.1}O{sub 5+δ} synthesized in oxygen crystallized in orthorhombic a{sub p} × 2a{sub p} × 2a{sub p} (sp. gr. Pmmm) structure. The structural parameters were refined by the Rietveld analysis. It was shown that parameter a remains practically constant while parameter c gradually increases with the increase of iron content. The changes of oxygen content in HoBaCo{sub 2−x}Fe{sub x}O{sub 5+δ} (x = 0, 0.2, 0.4) were measured by TGA within the temperature range 25–1100 °C in air. The absolute value of oxygen content was determined by the reduction of the samples in hydrogen flow. The influence of oxygen and iron content on the crystal structure has been discussed. The chemical stability of HoBaCo{sub 2−x}Fe{sub x}O{sub 5+δ} in contact with the solid electrolyte materials Ce{sub 0.8}Sm{sub 0.2}O{sub 2} and Zr{sub 0.85}Y{sub 0.15}O{sub 2} was examined.
- OSTI ID:
- 22341665
- Journal Information:
- Materials Research Bulletin, Vol. 48, Issue 6; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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