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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.48 [2010] >
IJPAP Vol.48(04) [April 2010] >
| Title: | Modified Ghiorso equation of state for CaMgSi2O6 silicate melt at 1673 K |
| Authors: | Kumar, M S
Sharma, B S |
| Keywords: | Equation of state
Bulk modulus
Isothermal pressure-volume relationship
Silicate melt |
| Issue Date: | Apr-2010 |
| Publisher: | CSIR |
| Abstract: | Ghiorso has recently
developed a functional form for an equation of state (EOS) of molten silicate
liquids. The EOS is designed for application over a wide range of melt
compositions which can be used from reference conditions to very high
pressures. It is emphasized here that the Ghiorso EOS does not satisfy the
thermodynamic boundary conditions at infinite pressure. Ghiorso EOS has been
modified to make it consistent with the Stacey thermodynamics at extreme
compression. Various relationships between the compression ratio (V/V0) and pressure P have been studied for the
silicate melt CaMgSi2O6 at 1673 K. The pressure-volume
isothermal relationship, isothermal bulk modulus K and its pressure derivative have been calculated using five
different forms of EOS viz. Birch Murnaghan third order EOS, Vinet-Rydberg EOS,
Stacey EOS, Ghiorso EOS and the modified Ghiorso EOS. It is found that the
modified Ghiorso EOS developed in the present study gives the satisfactory
results which is in good agreement with the Stacey reciprocal-K' EOS. |
| Page(s): | 282-286 |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.48(04) [April 2010]
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