Polyamorphic systems: Difference between revisions
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Some solid compounds can exist in two or more '''polymorphs''' with different atomic structures but the same chemical composition. | 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''' | 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. | 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 | 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=== | ||
*[[Germanium]] | *[[Germanium]] | ||
| Line 14: | Line 14: | ||
*[[Water]] | *[[Water]] | ||
==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.275.5298.322 Peter H. Poole, Tor Grande, C. Austen Angell, Paul F. McMillan "Polymorphic Phase Transitions in Liquids and Glasses", Science '''275''' pp. 322 - 323 (1997)] | #[http://dx.doi.org/10.1126/science.275.5298.322 Peter H. Poole, Tor Grande, C. Austen Angell, Paul F. McMillan "Polymorphic Phase Transitions in Liquids and Glasses", Science '''275''' pp. 322 - 323 (1997)] | ||
#[http://dx.doi.org/10.1038/35003088 Paul McMillan "Phase transitions: Jumping between liquid states", Nature '''403''' pp. 151-152 (2000)] | #[http://dx.doi.org/10.1038/35003088 Paul McMillan "Phase transitions: Jumping between liquid states", Nature '''403''' pp. 151-152 (2000)] | ||
#[http://dx.doi.org/10.1126/science.1104417 Jeff L. Yarger and George H. Wolf "Polymorphism in Liquids", Science '''306''' pp. 820 - 821 (2004)] | #[http://dx.doi.org/10.1126/science.1104417 Jeff L. Yarger and George H. Wolf "Polymorphism in Liquids", Science '''306''' pp. 820 - 821 (2004)] | ||
Revision as of 15:06, 30 April 2007
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
- Germanium
- n-butanol
- Phosphorous
- Ramp model
- Roberts and Debenedetti model
- Hemmer and Stell model
- Silica
- Triphenyl phosphite
- Water
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)