The Gibbs energy formulation of alpha, gamma, and liquid Fe2SiO4 using Grover, Getting, and Kennedy's empirical relation between volume and bulk modulus
Mhg. Jacobs et al., The Gibbs energy formulation of alpha, gamma, and liquid Fe2SiO4 using Grover, Getting, and Kennedy's empirical relation between volume and bulk modulus, GEOCH COS A, 65(22), 2001, pp. 4231-4242
The empirical linear relation between the volume and logarithm of bulk modu
lus of metals, discovered by Grover, Getting, and Kennedy is taken as the b
asis for our equation of state. Recently, we have shown that we can use thi
s equation of state to make accurate predictions of thermochemical and ther
mophysical properties at high pressure and high temperatures for MgO and th
e polymorphs of Mg2SiO4. Using the available experimental information, the
equation of state is applied to the two polymorphs and the liquid form of F
e2SiO4 to develop a consistent dataset of their thermodynamic properties in
the temperature range between 150 and 2500 K and pressure range between 1
bar 13 GPa. Using thermodynamic methods we are able to discriminate experim
ental data from different sources. The results presented here are compared
with results obtained with modem databases. For (Mg-1 (-) (x),Fe-x)(2)SiO4
solid solutions around a pyrolitic composition, we conclude that bulk sound
velocity is not a strong discriminator in selecting Gibbs energy formulati
ons for Fe2SiO4 using one database versus another. This is in contrast to w
hat we found for Mg2SiO4 Copyright (C) 2001 Elsevier Science Ltd.