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is a rigid planar four-site interaction potential for [[water]], having a similar geometry to the  [[BF model of water |Bernal and  Fowler model]], which was proposed in 1933.
 
is a rigid planar four-site interaction potential for [[water]], having a similar geometry to the  [[BF model of water |Bernal and  Fowler model]], which was proposed in 1933.
 
==Parameters==
 
==Parameters==
The TIP4P model consists of a [[Lennard-Jones model | Lennard-Jones site]] for the [[oxygen]] atom, and three charge sites.
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[[Image:Four_site_water_model.png‎|center|400px]]
::[[Image:Four_site_water_model.png‎|400px]]
 
  
  
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| 0.9572 || 104.52 ||  3.154 || 78.0 || 0 || 0.52 || -2q(H) || 0.15
 
| 0.9572 || 104.52 ||  3.154 || 78.0 || 0 || 0.52 || -2q(H) || 0.15
 
|}
 
|}
 
 
==Phase diagram==
 
==Phase diagram==
 
The following is the phase diagram of the TIP4P model in the [[Phase diagrams: Pressure-temperature plane |pressure-temperature plane]] (adapted from Fig. 11 of <ref name="multiple2">[http://dx.doi.org/10.1063/1.3156856  J. L. Aragones and C. Vega "Plastic crystal phases of simple water models", Journal of Chemical Physics '''130''' 244504 (2009)]</ref>).
 
The following is the phase diagram of the TIP4P model in the [[Phase diagrams: Pressure-temperature plane |pressure-temperature plane]] (adapted from Fig. 11 of <ref name="multiple2">[http://dx.doi.org/10.1063/1.3156856  J. L. Aragones and C. Vega "Plastic crystal phases of simple water models", Journal of Chemical Physics '''130''' 244504 (2009)]</ref>).

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