Synthesis of Bi25FeO39 by molten salts method and its mössbauer spectrum
| Autor: | Jesús Alberto León Flores, José Luis Pérez Mazariego, Vivianne Marquina Fábrega, Shirley Saraí Flores Morales, Raúl W. Gómez González |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Diffraction Materials science Rietveld refinement Spectrum (functional analysis) Analytical chemistry 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Paramagnetism Nuclear magnetic resonance 0103 physical sciences X-ray crystallography Mössbauer spectroscopy Mossbauer spectra Electrical and Electronic Engineering 0210 nano-technology Powder diffraction |
| Zdroj: | Physica B: Condensed Matter. 504:109-111 |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/j.physb.2016.10.019 |
| Popis: | A sample of Bi 25 FeO 39 was synthesized by the molten salts method in 2 h at 750 °C with KCl-KBr as reaction media. The sample was characterized with X-ray powder diffraction and Mossbauer spectroscopy. The Rietveld refinement of the X-ray diffraction confirms that a sillenite type structure with a cell parameter a =10.190(4) A was achieved, with only small traces of Bi 2 O 3 . In order to get a Mossbauer spectrum with a good signal to noise ratio, the synthesis was made using 95% enriched α– 57 Fe 2 O 3 . To our knowledge, this is the first time that a Mossbauer spectrum for the Bi 25 FeO 39 has been recorded. The nonappearance of a magnetic sextet confirms its paramagnetic behavior. The measured Mossbauer parameters (IS=0.20±0.004 mm/s and QS=0.2±0.07 mm/s) correspond to Fe +3 in very symmetric surroundings, and rule out some interpretations given to the doublet observed in some Mossbauer spectra of BiFeO 3 . |
| Databáze: | OpenAIRE |
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