报告人：David L. Price 教授
Conditions Extrêmes et Matériaux : Haute Température et Irradiation, Orleans, France
题目：STABLE AND SUPERCOOLED LEVITATED LIQUIDS
Measurements of liquid structure, dynamics and transport are important in advancing condensed matter theory, in developing predictive models, and in establishing structure-property-process relationships in high temperature materials science. The major experimental difficulties encountered in obtaining structural data on liquids at temperatures above about 1000K are (i) reactions of the samples with container walls, and (ii) influence of the containers on the structural measurements. Recently, a number of research groups around the world have attempted to overcome these problems by employing levitation techniques in conjunction with x-ray and neutron scattering to study the properties of highmelting, corrosive liquids. Several key advantages of these methods include (a) the elimination of container interactions and container-derived impurities, (b) rapid access to high temperatures, (c) localized heating conditions, and (d) access to the supercooled liquid and other metastable states. In Orléans we have chosen to work with aerodynamic levitation in conjunction with laser heating.
My talk will review recent results on some levitated liquid oxides and metals in both the stable and supercooled states. Structural information was obtained with x-ray and neutron diffraction and the dynamics were studied with inelastic x-ray scattering. The results were interpreted with the help of molecular dynamics computer simulations carried out by our collaborators.
David L. Price obtained a Ph.D. in Physics from Cambridge University under the supervision of G. L. Squires. He has subsequently had a 40-year career in research and administration involving neutron and x-ray experiments and facilities. After a postdoctoral appointment at the High-Flux Beam Reactor (HFBR) at Brookhaven National Laboratory, he joined the staff at Argonne National Laboratory where he served variously as Senior Scientist, Director of the Solid-State Science Division and Director of the Intense Pulsed Neutron Source (IPNS) during its construction and commissioning phases. He later joined Oak Ridge National Laboratory as Executive Director of the High-Flux Isotope Reactor and Center for Neutron Scattering. He has been invited as Distinguished Visiting Professor at the Graduate University for Advanced Studies, Hayama, Japan, and as Visiting Fellow Commoner at Trinity College, Cambridge, UK. He received the Warren Prize of the American Crystallographic Association in 1997 and an Alexander Von Humboldt Research Award in 1998. He is a Fellow of the American Physical Society, the Institute of Physics, UK, and the Neutron Scattering Society of America.
Dr. Price’s specific research interests include order and disorder in solids and liquids, the dynamics of disordered systems, the glass transition and melting, neutron diffraction with isotope substitution, and deep inelastic and quasielastic neutron scattering. His monograph on High-Temperature Levitated Materials was published by Cambridge University Press in 2010, and the first volume of a new series on Neutron Scattering appeared in 2013. He has over 250 refereed publications and has designed and commissioned neutron scattering spectrometers at the HFBR and at the CP-5 Research Reactor and the IPNS at Argonne.