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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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Christensen, Mogens
Aarhus University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (53/53 displayed)
- 2024Aligned Permanent Magnet Made in Seconds–An In Situ Diffraction Studycitations
- 2024The Chemistry of Spinel Ferrite Nanoparticle Nucleation, Crystallization, and Growthcitations
- 2024Aligned Permanent Magnet Made in Seconds:An In Situ Diffraction Studycitations
- 2024High-performance hexaferrite magnets tailored through alignment of shape-controlled nanocompositescitations
- 2023High-Performance Hexaferrite Ceramic Magnets Made from Nanoplatelets of Ferrihydrite by High-Temperature Calcination for Permanent Magnet Applicationscitations
- 2023Sintering in seconds, elucidated by millisecond in situ diffractioncitations
- 2023Defect-Engineering by Solvent Mediated Mild Oxidation as a Tool to Induce Exchange Bias in Metal Doped Ferritescitations
- 2022In-depth investigations of size and occupancies in cobalt ferrite nanoparticles by joint Rietveld refinements of X-ray and neutron powder diffraction datacitations
- 2022Exploiting different morphologies of non-ferromagnetic interacting precursor’s for preparation of hexaferrite magnetscitations
- 2022Combined characterization approaches to investigate magnetostructural effects in exchange-spring ferrite nanocomposite magnetscitations
- 2021‘Need for Speed’: Sub-second in situ diffraction to unravel rapid sintering & texture evolution in ferrite magnets
- 2021‘Need for Speed’: Sub-second in situ diffraction to unravel rapid sintering & texture evolution in ferrite magnets
- 2021Uncorrelated magnetic domains in decoupled SrFe 12 O 19 /Co hard/soft bilayerscitations
- 2021Synthesis and Characterization of a Magnetic Ceramic Using an Easily Accessible Scale Setupcitations
- 2020Restructuring Metal–Organic Frameworks to Nanoscale Bismuth Electrocatalysts for Highly Active and Selective CO 2 Reduction to Formatecitations
- 2020Exploring the direct synthesis of exchange-spring nanocomposites by reduction of CoFe 2 O 4 spinel nanoparticles using in situ neutron diffractioncitations
- 2020Expanding the tunability and applicability of exchange-coupled/decoupled magnetic nanocompositescitations
- 2020Expanding the tunability and applicability of exchange-coupled/decoupled magnetic nanocompositescitations
- 2020Exploring the direct synthesis of exchange-spring nanocomposites by reduction of CoFe2O4 spinel nanoparticles using in situ neutron diffractioncitations
- 2020Restructuring Metal–Organic Frameworks to Nanoscale Bismuth Electrocatalysts for Highly Active and Selective CO<sub>2</sub> Reduction to Formatecitations
- 2020Restructuring Metal–Organic Frameworks to Nanoscale Bismuth Electrocatalysts for Highly Active and Selective $CO_{2}$ Reduction to Formatecitations
- 2020Correlation between microstructure, cation distribution and magnetism in Ni 1-: X Zn x Fe 2 O 4 nanocrystallitescitations
- 2019Novel fast heating furnaces for in situ powder neutron diffraction
- 2019Structure and magnetic properties of W-type hexaferritescitations
- 2019Magnetostructural effects in exchange-spring nanocomposite magnets probed by combined X-ray & neutron scattering
- 2019Novel in situ powder neutron diffraction setups – The creation of a modern magnetic compound
- 2019Air-heated solid–gas reaction setup for in situ neutron powder diffractioncitations
- 2019In Situ In-House Powder X-ray Diffraction Study of Zero-Valent Copper Formation in Supercritical Methanolcitations
- 2019In Situ In-House Powder X-ray Diffraction Study of Zero-Valent Copper Formation in Supercritical Methanolcitations
- 2019Laboratory setup for rapid in situ powder X-ray diffraction elucidating Ni particle formation in supercritical methanolcitations
- 2018Crystalline and magnetic structure-property relationship in spinel ferrite nanoparticlescitations
- 2018Nanoengineered High-Performance Hexaferrite Magnets by Morphology-Induced Alignment of Tailored Nanoplateletscitations
- 2018X-ray and neutron diffraction magnetostructural investigations on exchange-coupled nanocomposite magnets
- 2018Koercivitetsforbedring af strontium hexaferrit nano-krystallitter gennem morfologikontrolleret udglødning. ; Coercivity enhancement of strontium hexaferrite nano-crystallites through morphology controlled annealingcitations
- 2018Structural evolution and stability of Sc 2 (WO 4 ) 3 after discharge in a sodium-based electrochemical cellcitations
- 2018Approaching Ferrite-Based Exchange-Coupled Nanocomposites as Permanent Magnetscitations
- 2018Coercivity enhancement of strontium hexaferrite nano-crystallites through morphology controlled annealingcitations
- 2017Optimization of spring exchange coupled ferrites, studied by in situ neutron diffraction.
- 2016Continuous Flow Supercritical Water Synthesis and Temperature-Dependent Defect Structure Analysis of YAG and YbAG Nanoparticlescitations
- 2016Energy Product Enhancement in Imperfectly Exchange-Coupled Nanocomposite Magnetscitations
- 2016Towards atomistic understanding of polymorphism in the solvothermal synthesis of ZrO 2 nanoparticlescitations
- 2016Towards atomistic understanding of polymorphism in the solvothermal synthesis of ZrO2 nanoparticlescitations
- 2014Coupling in situ synchrotron radiation with ex situ spectroscopy characterizations to study the formation of Ba1−xSrxTiO3 nanoparticles in supercritical fluidscitations
- 2014Characterization of the interface between an Fe–Cr alloy and the p-type thermoelectric oxide Ca3Co4O9citations
- 2014Metal distribution and disorder in the crystal structure of [NH2Et2][Cr7MF8(tBuCO2)16] wheel molecules for M = Mn, Fe, Co, Ni, Cu, Zn and Cdcitations
- 2014Evolution of atomic structure during nanoparticle formationcitations
- 2014Characterization of the interface between an Fe–Cr alloy and the p -type thermoelectric oxide Ca 3 Co 4 O 9citations
- 2013In-situ synchrotron PXRD study of spinel LiMn2O4 nanocrystal formation
- 2013IN-SITU SYNCHROTRON PXRD STUDY OF SPINEL TYPE LiMn2O4 NANOCRYSTAL FORMATION
- 2013Pressure versus temperature effects on intramolecular electron transfer in mixed-valence complexescitations
- 2012Investigation of the correlation between stoichiometry and thermoelectric properties in a PtSb2 single crystalcitations
- 2012Low Cost High Performance Zinc Antimonide Thin Films for Thermoelectric Applicationscitations
- 2005Nanostructured Co1-xNix(Sb1-yTey)3 skutterudites: theoretical modeling, synthesis and thermoelectric propertiescitations
Places of action
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document
‘Need for Speed’: Sub-second in situ diffraction to unravel rapid sintering & texture evolution in ferrite magnets
Abstract
The magnetic behaviour of a permanent magnet emerges hierarchically over 6 orders of magnitude in length scales – from the atomic to the macro scale.[1] Intrinsic magnetic properties are determined by the underlying atomic & crystalline structure. Microstructural features like crystallite morphologies/sizes influence extrinsic magnetic behaviour.[2] The structure at the atomic- & nanoscale are effectively controlled by the material synthesis and numerous studies have focused on controlling these structures to tune magnetic properties.[3] However, for real-world applications, the nanoparticulate powders must be compacted. The crystallographic texture of the consolidated product is a key influencer on final performance. The proverbial “last mile” consolidation of loose nano powders with optimal magnetic properties to dense magnets is barely studied in literature and the effect of resultant texture on magnetic properties is even less understood. [2,4] Therefore, to truly optimize the magnetic performance of the final material, it is important to understand & control the structure at all hierarchical length scales.<br/>The consolidation of magnets is typically done either by mechanical compaction followed by sintering in conventional furnaces OR via hot compaction using complicated setups e.g., spark plasma sintering. The influence of the consolidation process on the final magnet’s structure and resultant properties has been conventionally studied in a ‘black-box’ manner. The structure of the final magnet is studied ex-situ, post-mortem via diffraction techniques and the impact on the magnetic performance is assessed.[4] Control over the composition & structure over multiple length scales is limited. Adding to it, consolidation affects the magnetic properties non-trivially, making optimization a tedious ‘trial-and-error’ process. A recently developed method – ultrafast high-temperature sintering (UHS) – reported by Wang et.al. (Science, May 2020) holds the potential to overcome these problems.[5] It operates on the principle of resistive Joule heating of carbon strips in an inert atmosphere to sinter compacted pellets. It allows for mechanical stability after fast sintering (~10s) at high temperatures (~3000ºC) with rapid heating rates (~104 ºC/min) and has been shown to successfully sinter ceramic materials with multiple phases while retaining stoichiometry and optimal grain sizes. However, knowledge of the structural evolution processes during sintering is still limited and the ‘black-box’ problem remains! <br/>To address this gap in knowledge, our group at Aarhus University has developed a custom-built furnace and sample environment - the Aarhus Rapid Ωhmic Sintering (AROS) sample environment - based on the UHS principle. The AROS setup combines the high temperature, rapid heating capabilities with the ability to use high-energy transmitted X-rays to probe the bulk structural evolution processes in situ & in real-time during sintering (Fig. 1). In this presentation, the capabilities of the AROS setup will be discussed. In August 2021, the AROS setup was tested at P02.1 to sinter pre-compacted pellets of iron oxide nanoparticles at elevated temperatures (900°C to 1200°C) in vacuum/inert atmosphere.The experiment investigated the formation of magnetic SrFe12O19 from non-magnetic anisotropic shaped nanocrystallites: FexOy (nano-shaped) + Sr2+ → SrFe12O19.[6] Continuously collected diffraction data at P02.1 provided information on phase transformation, crystallite growth & induced texture evolution processes in situ & in real-time. Results & insights from this test experiment probing the sintering process with unprecedented detail will also be presented. These investigations on the sintering process in situ provide crucial details towards plugging the “last mile” consolidation gap and enable the development of stronger permanent magnets in the future. Beyond this, the results help shed light on the dynamics of the densification/consolidation process with significant relevance to the science of materials sintering.<br/><br/>References:[1] (a) Leslie-Pelecky, D.L., & Rieke, R.D.,Chem. Mater. 8, 1770 (1996). (DOI:10.1021/cm960077f) (b) Skomski, R., J. Phys. Condens. Matter. 15, R841 (2003). (DOI:10.1088/0953-8984/15/20/202)<br/>[2] Sander, D. et.al., Phys. D. Appl. Phys. 50, 363001 (2017). (DOI:10.1088/1361-6463/aa81a1)<br/>[3] (a) Mohseni, F. et.al., J. Alloys Compd. 806, 120 (2019). (DOI:10.1016/j.jallcom.2019.07.162) (b) Volodchenkov, A.D. et.al., J. Mater. Sci. 54, 8276 (2019). (DOI:10.1007/s10853-019-03323-z) (c) Volodchenkov, A.D. et. al., J. Mater. Chem. C. 4, 5593 (2016). (DOI:10.1039/C6TC01300G) (d) Liu, F. et. al., Chem. Soc. Rev. 43, 8098 (2014). (DOI:10.1039/C4CS00162A)<br/>[4] (a) Skokov, K.P., & Gutfleisch, O.,Scr. Mater. 154, 289 (2018). (DOI:10.1016/j.scriptamat.2018.01.032) (b) Saura-Múzquiz, M. et.al., Nanoscale. 12, 9481 (2020). (DOI:10.1039/D0NR01728K...