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PUBLISHED ONLINE: 28 NOVEMBER 2010 | DOI: 10.1038/NPHYS1823 Glass transition with decreasing correlation
 

Summary: ARTICLES
PUBLISHED ONLINE: 28 NOVEMBER 2010 | DOI: 10.1038/NPHYS1823
Glass transition with decreasing correlation
length during cooling of Fe50Co50 superlattice and
strong liquids
Shuai Wei1
, Isabella Gallino1
, Ralf Busch1
and C. Austen Angell2
*
The glass transition is usually understood as a structural arrest that occurs during the cooling of liquids, trapping the system
before it can crystallize. It occurs for all liquid classes, including metals. Theoretical interest has focused on the dynamical
heterogeneity encountered during supercooling of `fragile' liquids. Many suggest that the slow-down is caused by increasing
dynamical correlation lengths. Here we report kinetics and thermodynamics of arrest in a system that disorders while in
its ground state, exhibits a large heat capacity change (Cp = Cp,mobile - Cp,arrested) on arrest, yet clearly is characterized by
a static correlation length that decreases when approaching the transition temperature Tg from above. We show that our
system, the Fe50Co50 superlattice, kinetically mimics an ideal `strong' liquid with a critical point. Introducing liquid critical-point
simulations, we can then argue that strong liquids differ from fragile liquids by occupying opposite flanks of an underlying
order­disorder transition, which can be continuous, critical or weakly first order.
P

  

Source: Angell, C. Austen - Department of Chemistry and Biochemistry, Arizona State University

 

Collections: Materials Science; Chemistry