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Colloidal model systems for undercooled metallic melts

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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Abstract

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
Authors:
AuthorsInstitution or Email of Authors
Klassen, Inaklassen.ina@dlr.de
Wette, Patrickpatrick.wette@dlr.de
Holland-Moritz, Dirkdirk.holland-moritz@dlr.der
Palberg, ThomasJohannes Gutenberg Universität Mainz
Herlach, Dieterdieter.herlach@dlr.de
Date:25 March 2010
Journal or Publication Title:DPG Verhandlungen 2010, Condensed Matter Section
Page Range:p. 534
Status:Published
Keywords:Colloids, Short-Range-Order, USAXS
Event Title:DPG Spring Meeting, Condensed Matter Section
Event Location:Regensburg
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)
Location: Köln-Porz
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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