Polyamorphic systems: Difference between revisions
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Note: glasses are not in thermodynamic equilibrium, so such transformations do not correspond to true phase transitions from one stable liquid to another. | 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=== | ===Polyamorphic systems=== | ||
[[Realistic models | Real systems]] that present liquid-liquid transitions: | |||
*[[Carbon]] | |||
*[[Germanium]] | *[[Germanium]] | ||
*[[Butanol |n-butanol]] | *[[Butanol |n-butanol]] | ||
*[[Phosphorous]] | *[[Phosphorous]] | ||
*[[Silica]] | *[[Silica]] | ||
*[[Silicon]] | *[[Silicon]] | ||
| Line 15: | Line 14: | ||
*[[Water]] | *[[Water]] | ||
*[[Yttria–alumina]] | *[[Yttria–alumina]] | ||
===Models=== | |||
[[Idealised models]] that present liquid-liquid transitions: | |||
*[[polyamorphism: Ramp model | Ramp model]] | |||
*[[Roberts and Debenedetti model]] | |||
*[[Hemmer and Stell model]] | |||
==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 11:45, 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
- C. A. Angell "Formation of Glasses from Liquids and Biopolymers", Science 267 pp. 1924 - 1935 (1995)
- Peter H. Poole, Tor Grande, C. Austen Angell, Paul F. McMillan "Polymorphic Phase Transitions in Liquids and Glasses", Science 275 pp. 322 - 323 (1997)
- Paul McMillan "Phase transitions: Jumping between liquid states", Nature 403 pp. 151-152 (2000)
- Jeff L. Yarger and George H. Wolf "Polymorphism in Liquids", Science 306 pp. 820 - 821 (2004)