The Experts below are selected from a list of 171 Experts worldwide ranked by ideXlab platform
Thomas Schenk - One of the best experts on this subject based on the ideXlab platform.
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Short-Range Order of stable and undercooled liquid titanium
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: Dirk Holland-moritz, Robert Bellissent, O. Heinen, Thomas SchenkAbstract:This work presents investigations on the Short-Range Order of stable and undercooled melts of Ti. In Order to deeply undercool the melts, they are containerlessly processed under high purity conditions by application of the electromagnetic levitation technique. This technique is combined with neutron scattering at the Institut Laue-Langevin, Grenoble, France, in Order to determine the structure factors of the liquids as a function of the temperature. The experimental data are well described if an icosahedral Short-Range Order is assumed to prevail in the melt, which consists of larger polytetrahedral aggregates such as dodecahedral clusters.
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Short-Range Order in undercooled and stable melts forming quasicrystals and approximants and its influence on nucleation
Philosophical Magazine, 2005Co-Authors: Dirk Holland-moritz, Thomas Schenk, Virginie Simonet, Robert BellissentAbstract:An icosahedral Short-Range Order has been predicted to prevail in undercooled metallic melts. For melts of pure metals this hypothesis was recently experimentally confirmed by diffraction experiments. This work presents results of neutron scattering experiments on the Short-Range Order of stable and undercooled liquids of alloys forming quasicrystals and polytetrahedral crystals. The studies indicate that an icosahedral topological Short-Range Order prevails in all of the investigated melts. The influence of this icosahedral Short-Range Order on the nucleation behaviour of solid phases from the undercooled liquid is discussed.
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Short-Range Order in undercooled metallic liquids
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2004Co-Authors: Dirk Holland-moritz, Thomas Schenk, Virginie Simonet, Robert Bellissent, Pierre Convert, Thomas C. Hansen, Dieter M. HerlachAbstract:Abstract The containerless processing technique of electromagnetic levitation was combined with elastic neutron scattering in Order to study the Short-Range Order (SRO) of stable and deeply undercooled liquids of the pure elements Ni, Fe and Zr and of the quasicrystal-forming alloy Al65Cu25Co10. The results deliver experimental evidence for an icosahedral Short-Range Order (ISRO) prevailing in the investigated metallic melts.
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Icosahedral Short-Range Order in deeply undercooled metallic melts.
Physical review letters, 2002Co-Authors: Thomas Schenk, Dirk Holland-moritz, Virginie Simonet, Robert Bellissent, Dieter M. HerlachAbstract:Experimental evidence of icosahedral Short-Range Order in stable and deeply undercooled melts of pure metallic elements is obtained using the combination of electromagnetic levitation with neutron scattering. This icosahedral Short-Range Order is shown to occur in the bulk metallic melt independently of the system investigated. It strongly increases with the degree of undercooling.
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Short-Range Order in undercooled melts forming quasicrystals and approximants
Journal of Alloys and Compounds, 2002Co-Authors: Dirk Holland-moritz, Thomas Schenk, Virginie Simonet, Robert Bellissent, Pierre Convert, Thomas C. HansenAbstract:Abstract For the first time, the Short-Range Order of deeply undercooled liquids of alloys forming quasicrystalline and polytetrahedral phases (Al13Fe4 and Al74Co26) is investigated by combining the containerless processing technique of electromagnetic levitation with elastic neutron scattering. The experimentally determined structure factor, S(Q), was simulated by assuming that clusters with different structures exist in the liquid. The best fit of the experimental data is obtained under the assumption of an icosahedral Short-Range Order. This supports the nearly 50 year-old prediction of Frank that an icosahedral Short-Range Order prevails in undercooled metallic liquids.
Dirk Holland-moritz - One of the best experts on this subject based on the ideXlab platform.
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Short-Range Order of stable and undercooled liquid titanium
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: Dirk Holland-moritz, Robert Bellissent, O. Heinen, Thomas SchenkAbstract:This work presents investigations on the Short-Range Order of stable and undercooled melts of Ti. In Order to deeply undercool the melts, they are containerlessly processed under high purity conditions by application of the electromagnetic levitation technique. This technique is combined with neutron scattering at the Institut Laue-Langevin, Grenoble, France, in Order to determine the structure factors of the liquids as a function of the temperature. The experimental data are well described if an icosahedral Short-Range Order is assumed to prevail in the melt, which consists of larger polytetrahedral aggregates such as dodecahedral clusters.
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Short-Range Order in undercooled and stable melts forming quasicrystals and approximants and its influence on nucleation
Philosophical Magazine, 2005Co-Authors: Dirk Holland-moritz, Thomas Schenk, Virginie Simonet, Robert BellissentAbstract:An icosahedral Short-Range Order has been predicted to prevail in undercooled metallic melts. For melts of pure metals this hypothesis was recently experimentally confirmed by diffraction experiments. This work presents results of neutron scattering experiments on the Short-Range Order of stable and undercooled liquids of alloys forming quasicrystals and polytetrahedral crystals. The studies indicate that an icosahedral topological Short-Range Order prevails in all of the investigated melts. The influence of this icosahedral Short-Range Order on the nucleation behaviour of solid phases from the undercooled liquid is discussed.
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Short-Range Order in undercooled metallic liquids
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2004Co-Authors: Dirk Holland-moritz, Thomas Schenk, Virginie Simonet, Robert Bellissent, Pierre Convert, Thomas C. Hansen, Dieter M. HerlachAbstract:Abstract The containerless processing technique of electromagnetic levitation was combined with elastic neutron scattering in Order to study the Short-Range Order (SRO) of stable and deeply undercooled liquids of the pure elements Ni, Fe and Zr and of the quasicrystal-forming alloy Al65Cu25Co10. The results deliver experimental evidence for an icosahedral Short-Range Order (ISRO) prevailing in the investigated metallic melts.
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Icosahedral Short-Range Order in deeply undercooled metallic melts.
Physical review letters, 2002Co-Authors: Thomas Schenk, Dirk Holland-moritz, Virginie Simonet, Robert Bellissent, Dieter M. HerlachAbstract:Experimental evidence of icosahedral Short-Range Order in stable and deeply undercooled melts of pure metallic elements is obtained using the combination of electromagnetic levitation with neutron scattering. This icosahedral Short-Range Order is shown to occur in the bulk metallic melt independently of the system investigated. It strongly increases with the degree of undercooling.
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Short-Range Order in undercooled melts forming quasicrystals and approximants
Journal of Alloys and Compounds, 2002Co-Authors: Dirk Holland-moritz, Thomas Schenk, Virginie Simonet, Robert Bellissent, Pierre Convert, Thomas C. HansenAbstract:Abstract For the first time, the Short-Range Order of deeply undercooled liquids of alloys forming quasicrystalline and polytetrahedral phases (Al13Fe4 and Al74Co26) is investigated by combining the containerless processing technique of electromagnetic levitation with elastic neutron scattering. The experimentally determined structure factor, S(Q), was simulated by assuming that clusters with different structures exist in the liquid. The best fit of the experimental data is obtained under the assumption of an icosahedral Short-Range Order. This supports the nearly 50 year-old prediction of Frank that an icosahedral Short-Range Order prevails in undercooled metallic liquids.
Robert Bellissent - One of the best experts on this subject based on the ideXlab platform.
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Short-Range Order of stable and undercooled liquid titanium
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: Dirk Holland-moritz, Robert Bellissent, O. Heinen, Thomas SchenkAbstract:This work presents investigations on the Short-Range Order of stable and undercooled melts of Ti. In Order to deeply undercool the melts, they are containerlessly processed under high purity conditions by application of the electromagnetic levitation technique. This technique is combined with neutron scattering at the Institut Laue-Langevin, Grenoble, France, in Order to determine the structure factors of the liquids as a function of the temperature. The experimental data are well described if an icosahedral Short-Range Order is assumed to prevail in the melt, which consists of larger polytetrahedral aggregates such as dodecahedral clusters.
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Short-Range Order in undercooled and stable melts forming quasicrystals and approximants and its influence on nucleation
Philosophical Magazine, 2005Co-Authors: Dirk Holland-moritz, Thomas Schenk, Virginie Simonet, Robert BellissentAbstract:An icosahedral Short-Range Order has been predicted to prevail in undercooled metallic melts. For melts of pure metals this hypothesis was recently experimentally confirmed by diffraction experiments. This work presents results of neutron scattering experiments on the Short-Range Order of stable and undercooled liquids of alloys forming quasicrystals and polytetrahedral crystals. The studies indicate that an icosahedral topological Short-Range Order prevails in all of the investigated melts. The influence of this icosahedral Short-Range Order on the nucleation behaviour of solid phases from the undercooled liquid is discussed.
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Short-Range Order in undercooled metallic liquids
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2004Co-Authors: Dirk Holland-moritz, Thomas Schenk, Virginie Simonet, Robert Bellissent, Pierre Convert, Thomas C. Hansen, Dieter M. HerlachAbstract:Abstract The containerless processing technique of electromagnetic levitation was combined with elastic neutron scattering in Order to study the Short-Range Order (SRO) of stable and deeply undercooled liquids of the pure elements Ni, Fe and Zr and of the quasicrystal-forming alloy Al65Cu25Co10. The results deliver experimental evidence for an icosahedral Short-Range Order (ISRO) prevailing in the investigated metallic melts.
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Icosahedral Short-Range Order in deeply undercooled metallic melts.
Physical review letters, 2002Co-Authors: Thomas Schenk, Dirk Holland-moritz, Virginie Simonet, Robert Bellissent, Dieter M. HerlachAbstract:Experimental evidence of icosahedral Short-Range Order in stable and deeply undercooled melts of pure metallic elements is obtained using the combination of electromagnetic levitation with neutron scattering. This icosahedral Short-Range Order is shown to occur in the bulk metallic melt independently of the system investigated. It strongly increases with the degree of undercooling.
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Short-Range Order in undercooled melts forming quasicrystals and approximants
Journal of Alloys and Compounds, 2002Co-Authors: Dirk Holland-moritz, Thomas Schenk, Virginie Simonet, Robert Bellissent, Pierre Convert, Thomas C. HansenAbstract:Abstract For the first time, the Short-Range Order of deeply undercooled liquids of alloys forming quasicrystalline and polytetrahedral phases (Al13Fe4 and Al74Co26) is investigated by combining the containerless processing technique of electromagnetic levitation with elastic neutron scattering. The experimentally determined structure factor, S(Q), was simulated by assuming that clusters with different structures exist in the liquid. The best fit of the experimental data is obtained under the assumption of an icosahedral Short-Range Order. This supports the nearly 50 year-old prediction of Frank that an icosahedral Short-Range Order prevails in undercooled metallic liquids.
Rajesh Kumar - One of the best experts on this subject based on the ideXlab platform.
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Quantifying the Short-Range Order in Amorphous Silicon by Raman Scattering
Analytical chemistry, 2018Co-Authors: Priyanka Yogi, Manushree Tanwar, Shailendra K. Saxena, Suryakant Mishra, Devesh K. Pathak, Anjali Chaudhary, Pankaj R. Sagdeo, Rajesh KumarAbstract:Quantification of the Short-Range Order in amorphous silicon has been formulized using Raman scattering by taking into account established frameworks for studying the spectral line-shape and size dependent Raman peak shift. A theoretical line-shape function has been proposed for representing the observed Raman scattering spectrum from amorphous-Si-based on modified phonon confinement model framework. While analyzing modified phonon confinement model, the term “confinement size” used in the context of nanocrystalline Si was found analogous to the Short-Range Order distance in a-Si thus enabling one to quantify the same using Raman scattering. Additionally, an empirical formula has been proposed using bond polarizability model for estimating the Short-Range Order making one capable to quantify the distance of Short-Range Order by looking at the Raman peak position alone. Both the proposals have been validated using three different data sets reported by three different research groups from a-Si samples prepa...
Boaz Pokroy - One of the best experts on this subject based on the ideXlab platform.
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Size Effect on the Short Range Order and the Crystallization of Nanosized Amorphous Alumina
Crystal Growth & Design, 2014Co-Authors: Leonid Bloch, Yaron Kauffmann, Boaz PokroyAbstract:Drawing inspiration from nature, where some organisms can control the Short-Range Order of amorphous minerals, we successfully manipulated the Short-Range Order of amorphous alumina by surface and size effects. By utilizing the atomic layer deposition (ALD) method to grow amorphous nanometrically thin films, combined with state-of-the-art electron energy loss spectroscopy (EELS) and X-ray photoelectron spectroscopy (XPS), we showed experimentally that the Short-Range Order in such films is strongly influenced by size. This phenomenon is equivalent to the well-known size effect on lattice parameters and on the relative stability of different polymorphs in crystalline materials. Additionally, direct measurements of crystallization temperature have shown a dramatic increase in amorphous to crystalline phase transition temperature for thinner amorphous Al2O3 films. Finally, we show that the Short-Range Order changes differently, as dictated by size, while still in the amorphous phase, before the amorphous to ...
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Size Effect on the Short Range Order in Amorphous Materials
arXiv: Materials Science, 2014Co-Authors: Leonid Bloch, Yaron Kauffmann, Boaz PokroyAbstract:Drawing inspiration from nature, where some organisms can control the short range Order of amorphous minerals, we successfully manipulated the short range Order of amorphous alumina by surface and size effects. By utilizing the Atomic Layer Deposition (ALD) method to grow amorphous nanometrically thin films, combined with state-of-the-art electron energy loss spectroscopy (EELS) and X-ray photoelectron spectroscopy (XPS), we showed experimentally that the short range Order in such films is strongly influenced by size. This phenomenon is equivalent to the well-known size effect on lattice parameters and on the relative stability of different polymorphs in crystalline materials. We also show that the short range Order changes while still in the amorphous phase, before the amorphous to crystalline transformation takes place.
