Computer Science
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007gecoa..71.1249g&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 71, Issue 5, p. 1249-1265.
Computer Science
17
Scientific paper
In implementing into a molecular dynamics simulation code a simple interionic potential developed to describe the nine component system K2O Na2O CaO MgO FeO Fe2O3 Al2O3 TiO2 SiO2 (KNCMFATS), it has been possible to reproduce satisfactorily a number of thermodynamic, structural and transport properties of a representative set of natural silicate melts. An important conclusion reached in this study is the good transferability of the potential from felsic to ultramafic compositions although this transferability becomes less accurate with high silica contents (rhyolitic composition and beyond) and with very iron-rich silicates (e.g. fayalite). A key feature of the simulation is to make the link between macroscopic properties of the melt and its microscopic structure and dynamics. We thus obtain a relationship between the molar volume of the melt, the number of network modifiers and the oxygen coordination number. The simulation also allows one to quantify the coordination environment around the cations as function of the melt composition. Furthermore, the electrical conductivity of the high temperature liquid is investigated.
Guillot Bertrand
Sator Nicolas
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