| 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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Kløve, Magnus
Aarhus University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2024Optical Floating-Zone Furnace Single-Crystal Synthesis of van der Waals Material InSe
- 2024Optical Floating-Zone Furnace Single-Crystal Synthesis of van der Waals Material InSe
- 2024H2S-Treated Nickel Foam Electrocatalyst for Alkaline Water Electrolysis under Industrial Conditionscitations
- 2024Efficient and scalable H2S treated nickel foam electrocatalyst for alkaline water electrolysis under industrial conditions
- 2023Unveiling the formation mechanism of PbxPdy intermetallic phases in solvothermal synthesis using in situ X-ray total scatteringcitations
- 2023Unveiling the formation mechanism of PbxPdy intermetallic phases in solvothermal synthesis using in situ X-ray total scatteringcitations
- 2023Unveiling the formation mechanism of Pb x Pd y intermetallic phases in solvothermal synthesis using in situ X-ray total scatteringcitations
- 2022Synthesis of Phase-Pure Thermochromic VO2 (M1)citations
Places of action
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article
Synthesis of Phase-Pure Thermochromic VO2 (M1)
Abstract
<p>A highly reproducible, simple, and inexpensive synthesis method for obtaining phase-pure thermochromic monoclinic VO<sub>2</sub> (M1) is presented. Vanadium(III) oxide and ammonium metavanadate were used as starting materials and no additional reducing agents are required. Heating a mixture of these two components under an argon atmosphere at 750 °C for 2-4 h provides the direct formation of VO2 (M1) without detectable impurity phases. The formation reaction of VO2 (M1) was studied using in situ powder X-ray diffraction (PXRD), where a pressed pellet of the precursor material was heated during the continuous collection of PXRD data on a two-dimensional detector. The formation takes place via at least two crystalline intermediate phases where the first forms at 170-185 °C (likely an ammonium and oxygen deficient (NH4)1-δVO3-δ phase), and the second at 230 °C (likely a more disordered phase due to the increased background intensity). We assume that the solid-state reaction between the unknown but likely disordered vanadate phase and vanadium(III) oxide starts at 395 °C in concert with the appearance of several other unknown crystalline phases. At 610-750 °C, phase-pure rutile VO2 (P42/mnm) is obtained, which upon cooling converts to monoclinic VO2 (M1). The product composition, microstructure, and homogeneity are characterized by Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray spectroscopy. The synthesized VO2 (M1) has a sharp reversible insulator-to-metal transition at 71.3 °C during heating and 59.5 °C during cooling, as characterized using differential scanning calorimetry, and resistivity and magnetic property measurements.</p>