Difference between revisions of "Polyamorphic systems"

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===Models===
 
===Models===
 
[[Idealised models]] that present liquid-liquid transitions:
 
[[Idealised models]] that present liquid-liquid transitions:
*[[polyamorphism: Ramp model | Ramp model]]
+
*[[Buldyrev and Stanley model]]
 +
*[[Hemmer and Stell model]]
 +
*[[polyamorphism: Ramp model | Jagla ramp model]]
 
*[[Roberts and Debenedetti model]]
 
*[[Roberts and Debenedetti model]]
*[[Hemmer and Stell model]]
+
*[[Square shoulder + square well]]
 +
 
 
==General reading==
 
==General reading==
 
#[http://dx.doi.org/10.1126/science.267.5206.1924 C. A. Angell "Formation of Glasses from Liquids and Biopolymers", Science '''267''' pp. 1924 - 1935 (1995)]
 
#[http://dx.doi.org/10.1126/science.267.5206.1924 C. A. Angell "Formation of Glasses from Liquids and Biopolymers", Science '''267''' pp. 1924 - 1935 (1995)]

Revision as of 13:11, 22 February 2008

Some solid compounds can exist in two or more polymorphs with different atomic structures but the same chemical composition. In the case of a pure element, this behavior is termed allotropy. The existence of liquid polymorphs is known as polyamorphism, i.e. the ability of a substance to exist in several different amorphous modifications. Note: glasses are not in thermodynamic equilibrium, so such transformations do not correspond to true phase transitions from one stable liquid to another.

Polyamorphic systems

Real systems that present liquid-liquid transitions:

Models

Idealised models that present liquid-liquid transitions:

General reading

  1. C. A. Angell "Formation of Glasses from Liquids and Biopolymers", Science 267 pp. 1924 - 1935 (1995)
  2. Peter H. Poole, Tor Grande, C. Austen Angell, Paul F. McMillan "Polymorphic Phase Transitions in Liquids and Glasses", Science 275 pp. 322 - 323 (1997)
  3. Paul McMillan "Phase transitions: Jumping between liquid states", Nature 403 pp. 151-152 (2000)
  4. Jeff L. Yarger and George H. Wolf "Polymorphism in Liquids", Science 306 pp. 820 - 821 (2004)