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Getting the hot structures

Published online by Cambridge University Press:  01 March 2012

K. F. Kelton  and
A. K. Gangopadhyay
K. F. Kelton
Affiliation:
Department of Physics, Washington University, St. Louis, Missouri 63130
A. K. Gangopadhyay
Affiliation:
Department of Physics, Washington University, St. Louis, Missouri 63130
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Abstract

The recent advances in levitation methods for materials processing now enable structural, thermo-physical property, and phase transition studies to be made on high temperature solids and liquids without container contamination. These studies have led to new insights into the liquid state and have revealed how local order in the liquid can dictate phase formation. In this article, levitation techniques are briefly discussed, focusing most on electrostatic levitation. Recent synchrotron studies of electrostatically levitated undercooled Ti–Zr–Ni liquids are presented, which demonstrate that developing icosahedral short-range order in the liquid causes the nucleation of a metastable icosahedral quasicrystal instead of the stable tetrahedral Laves phase. In addition to providing the first experimental proof of a half-century-old hypothesis linking the order of the liquid with the nucleation barrier, these data raise new questions about the general applicability of the thermodynamic model assumed in the classical theory of nucleation. The combination of electrostatic levitation and synchrotron high-energy x-ray diffraction also allows rapid and accurate determinations of phase diagrams for high temperature materials. This is demonstrated usingTi–Fe–Si–O as a case study. This new technique, then, is of practical as well as basic importance.

Type
Read Hot X-Rays
Information
Powder Diffraction , Volume 20 , Issue 2 , June 2005 , pp. 87 - 93
Copyright
Copyright © Cambridge University Press 2005

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