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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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