Klassen, Ina and Wette, Patrick and Holland-Moritz, Dirk and Palberg, Thomas and Herlach, Dieter (2010) Colloidal model systems for undercooled metallic melts. In: DPG Verhandlungen 2010, Condensed Matter Section, p. 534. DPG Spring Meeting, Condensed Matter Section, 21. - 26. März 2010, Regensburg.
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Due to their mesoscopic length scales, colloidal suspensions are ideal model systems to address fundamental issues in condensed matter physics such as liquid ordering, nucleation and crystallization. Colloidal particles are several orders of magnitude larger than atoms in metals and their relaxation behavior is very sluggish compared to atomic systems. Due to the possibility of tunable interaction, systematic investigations of the short-range order in a charged colloidal silica system far from equilibrium state are presented. Therefore, timedependent structure factors in the undercooled state were measured applying Ultra Small Angle X-ray Scattering. The results of these investigations are compared to measurements on metallic systems represented by an undercooled Ni melt applying neutron scattering. The measured structure factors of both physically different systems are analyzed using the same evaluation method which reveals icosahedral short-range order in the melt phase of both systems, colloids and pure metals as well. In addition, due to the variation of the interaction potential from soft repulsive to hard-sphere like bahavior, icosahedral short-range order is replaced by a fcc structure near the solid-fluid phase boundary.
|Document Type:||Conference or Workshop Item (Speech)|
|Title:||Colloidal model systems for undercooled metallic melts|
|Date:||25 March 2010|
|Journal or Publication Title:||DPG Verhandlungen 2010, Condensed Matter Section|
|Page Range:||p. 534|
|Keywords:||Colloids, Short-Range-Order, USAXS|
|Event Title:||DPG Spring Meeting, Condensed Matter Section|
|Event Type:||international Conference|
|Event Dates:||21. - 26. März 2010|
|Organizer:||Deutsche Physikalische Gesellschaft|
|HGF - Research field:||Aeronautics, Space and Transport (old)|
|HGF - Program:||Space (old)|
|HGF - Program Themes:||W FR - Forschung unter Weltraumbedingungen (old)|
|DLR - Research area:||Space|
|DLR - Program:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research theme (Project):||W - Vorhaben Materialwissenschaftliche Forschung (old)|
|Institutes and Institutions:||Institute of Materials Physics in Space|
|Deposited By:||Dieter Herlach|
|Deposited On:||12 Apr 2010 09:26|
|Last Modified:||12 Apr 2010 09:26|
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