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BEGIN:VEVENT
DTSTAMP:20260815T092620Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20100330T193000Z
DTEND:20100330T203000Z
UID:event555@bu.edu
URL:http://physics.bu.edu/internal/events/show/555
SUMMARY:Liquid Structure and Phase Transitions 
DESCRIPTION:Featuring Ken Kelton\, Washington University\, St. Louis\nHoste
	d by: William Klein\nPoster: http://physics.bu.edu/internal//posters/2010_S
	pring/08_Kelton.pdf\n\nPart of the Physics Department Colloquia Series.\n\n
	Abstract:\nOur recent high-energy X-ray diffraction data from electrostatic
	ally-levitated transition metal liquids demonstrate the frequent developmen
	t of icosahedral short-range order (ISRO) with supercooling. This ordering 
	makes it difficult to nucleate the stable crystal phases\, in one case lead
	ing to the formation of a metastable icosahedral quasicrystal phase.  Those
	 studies confirm a half-century-old hypothesis relating the structure of th
	e liquid to the nucleation barrier and blur the distinction between homogen
	eous and heterogeneous nucleation.  Quantitative measurements of the time-d
	ependent nucleation rate in the glass and structural studies of the superco
	oled liquid demonstrate that for Zr59Ti3Cu20Ni8Al10 the ISRO increases on s
	upercooling into the glass\, supporting a frustration model of the glass tr
	ansition in that system.  Measurements of the density and surface tension h
	int at liquid/liquid phase transitions in some liquids\, which are associat
	ed with the developing ISRO.  In one case they correlate with a proposed st
	rong-to-fragile transition.  The implications of these and other coupled pr
	ocesses on phase formation\, stability and crystallization are discussed.
LOCATION: \, \, 
STATUS:CONFIRMED
CLASS:PUBLIC
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