| People | Locations | Statistics |
|---|---|---|
| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Murshed, Mohammad Mangir
University of Bremen
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (7/7 displayed)
- 2024Synthesis and characterization of mullite‐type Sn(Cr1-xVx)BO4: Structural, vibrational, magnetic, and thermal properties
- 2023Ceramic Open Cell Foams Featuring Plasmonic Hybrid Metal Nanoparticles for In Situ SERS Monitoring of Catalytic Reactionscitations
- 2023Gold Nanoparticle‐Coated Bioceramics for Plasmonically Enhanced Molecule Detection via Surface‐Enhanced Raman Scattering
- 2020Crystal structure of the synthetic analogue of iwateite, Na2BaMn(PO4)2: an X-ray powder diffraction and Raman studycitations
- 2016Bi2Fe4O9: Structural changes from nano- to micro-crystalline statecitations
- 2014Synthesis and characterization of mullite-type (Al1-xGax)4B2O9citations
- 2008Gallium substitution in the alumosilicate framework: synthesis and structural studies of hydro sodalitescitations
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article
Bi2Fe4O9: Structural changes from nano- to micro-crystalline state
Abstract
<jats:title>Abstract</jats:title><jats:p>Bi<jats:sub>2</jats:sub>Fe<jats:sub>4</jats:sub>O<jats:sub>9</jats:sub>was synthesized using a polyol-mediated method. X-ray powder diffraction (XRPD) revealed that the as-synthesized sample is nano-crystalline. During heating, the X-ray amorphous powder transformed into a rhombohedral perovskite-type bismuth ferrate followed by a second transformation into mullite-type Bi<jats:sub>2</jats:sub>Fe<jats:sub>4</jats:sub>O<jats:sub>9</jats:sub>at higher temperatures. This transformation was studied at<jats:italic>in-situ</jats:italic>conditions by temperature-dependent XRPD and<jats:sup>57</jats:sup>Fe Mössbauer spectroscopy. The<jats:sup>57</jats:sup>Fe Mössbauer spectra indicate the existence of two Fe<jats:sup>3+</jats:sup>species at two different octahedrally coordinated sites leading to the conclusion that the as-synthesized powder of the polyol synthesis possesses a disordered (Bi<jats:sub>1–<jats:italic>x</jats:italic></jats:sub>Fe<jats:sub><jats:italic>x</jats:italic></jats:sub>)FeO<jats:sub>3</jats:sub>perovskite structure. Rietveld refinements have unambiguously supported this observation and this results suggest that one third of the Bi<jats:sup>3+</jats:sup>sites are substituted by Fe<jats:sup>3+</jats:sup>representing the initial chemical composition. This study has shown that as-synthesized nano-materials are not always similar to the respective micro-crystalline ones.</jats:p>