Hydrothermal synthesis and structural characterization of (1−x)α-Fe2O3–xSnO2 nanoparticles
| Autor: | D. Tarabasanu-Mihaila, Monica Sorescu, B.H. Howard, Lucian Diamandescu, Valentin S. Teodorescu |
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| Rok vydání: | 2004 |
| Předmět: |
Mössbauer effect
Chemistry chemistry.chemical_element Corundum General Chemistry engineering.material Condensed Matter Physics Mole fraction Hydrothermal circulation Crystallography Transmission electron microscopy Mössbauer spectroscopy engineering Hydrothermal synthesis General Materials Science Tin |
| Zdroj: | Journal of Physics and Chemistry of Solids. 65:1021-1029 |
| ISSN: | 0022-3697 |
| DOI: | 10.1016/j.jpcs.2003.10.062 |
| Popis: | Structural and morphological characteristics of (1− x )α-Fe 2 O 3 – x SnO 2 ( x =0.0–1.0) nanoparticles obtained under hydrothermal conditions have been investigated by X-ray diffraction (XRD), transmission Mossbauer spectroscopy, scanning and transmission electron microscopy as well as energy dispersive X-ray analysis. On the basis of the Rietveld structure refinements of the XRD spectra at low tin concentrations, it was found that Sn 4+ ions partially substitute for Fe 3+ at the octahedral sites and also occupy the interstitial octahedral sites which are vacant in α-Fe 2 O 3 corundum structure. A phase separation of α-Fe 2 O 3 and SnO 2 was observed for x ≥0.4: the α-Fe 2 O 3 structure containing tin decreases simultaneously with the increase of the SnO 2 phase containing substitutional iron ions. The mean particle dimension decreases from 70 to 6 nm, as the molar fraction x increases up to x =1.0. The estimated solubility limits in the nanoparticle system (1− x )α-Fe 2 O 3 – x SnO 2 synthesized under hydrothermal conditions are: x ≤0.2 for Sn 4+ in α-Fe 2 O 3 and x ≥0.7 for Fe 3+ in SnO 2 . |
| Databáze: | OpenAIRE |
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