| People | Locations | Statistics |
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| 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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Alanazi, Abdulaziz
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (4/4 displayed)
- 2021Structural investigations of α-MnS nanocrystals and thin films synthesised from manganese(II) xanthates by hot injection, solvent-less thermolysis and doctor blade routes.citations
- 2020Heterometallic 3d-4f complexes as air-stable molecular pre-cursors in low temperature syntheses of stoichiometric rare-earth orthoferrite powderscitations
- 2019A molecular precursor route to quaternary chalcogenide CFTS (Cu2FeSnS4) powders as potential solar absorber materialscitations
- 2016Characterisation of an isotropic neutron source: a comparison of conventional neutron detectors and micro-silica glass bead thermoluminescent detectorscitations
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article
Heterometallic 3d-4f complexes as air-stable molecular pre-cursors in low temperature syntheses of stoichiometric rare-earth orthoferrite powders
Abstract
Four 3d-4f hetero-polymetallic complexes [Fe<sub>2</sub>Ln<sub>2</sub>((OCH<sub>2</sub>)<sub>3</sub>CR)<sub>2</sub>(O<sub>2</sub>C<sup>t</sup>Bu)<sub>6</sub>(H<sub>2</sub>O)<sub>4</sub>] (where Ln = La (<b>1</b> and <b>2</b>) and Gd (<b>3</b> and <b>4</b>); and R = Me (<b>1</b> and <b>3</b>) and Et (<b>2 </b>and <b>4</b>)) are synthesised and analysed using elemental analysis, Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA) and SQUID magnetometry. Crystal structures are obtained for both methyl derivatives and show that the complexes are isostructural and adopt a defective dicubane topology. The four heavy metals are connected with two alkoxide bridges. These four precursors are used as single-source precursors to prepare rare-earth orthoferrite pervoskites of the form LnFeO<sub>3</sub>. Thermal decomposition in a ceramic boat in a tube furnace gives orthorhombic LnFeO<sub>3</sub> powders using optimised temperatures and decomposition times: LnFeO<sub>3</sub> formed at 650 ℃ over 30 min, whereas GdFeO3 formed at 750 ℃ over 18 h. These materials are structurally characterised using powder X-ray diffraction, Raman spectroscopy, scanning electron microscopy, energy-dispersive X-ray map spectros-copy, and SQUID magnetometry. EDX spectroscopy mapping reveals a homogenous spatial distribution of elements for all four materials consistent with LnFeO<sub>3</sub>. Magnetic measurements on complexes <b>1</b>-<b>4</b> confirms the presence of weak antiferro-magnetic coupling between the central Fe(III) ions of the clusters and negligible ferromagnetic interaction with peripheral Gd(III) ions in <b>3</b> and <b>4</b>. Zero field cooled (ZFC) and field-cooled (FC) measurements of magnetization of LnFeO<sub>3</sub> and GdFeO<sub>3</sub> in the solid state suggests that both materials are ferromagnetic, and both materials show open magnetic hysteresis loops at 5 K and 300 K, with <i>M</i><sub>sat</sub> higher than previously reported for these as nanomaterials. We conclude that this is a new and facile low temperature route to these important magnetic materials that is potentially universal limited only by what metals can be programmed into the precursor complexes.