Equation of state data 

From here you can download the eos parameters for many phases as '.eos' files. These files can be 'loaded' directly in to the EosFit7 software so that
you can do calculations immediately. You can also use EosFit7c to modify the parameters within the files.
Important:




EoS useful for pressure measurement 
Quartz 
The PV EoS for quartz (SiO2) as determined by Scheidl et al (2016)
Journal of Applied Crystallography, 49, 21292137. A reprint is available as a
pdf file, Copyright © International Union of Crystallography.
We use quartz as an internal pressure standard in singlecrystal diamondanvil cell experiments at room temperature. We measure the volume of the quartz by diffraction and use this EoS to convert the measured volume to pressure. This new EoS extends to 19 GPa. It replaces the previous quartz EoS determined by Angel et al (1997). 
Old quartz 
The PV EoS for quartz (SiO2) as determined by Angel et al (1997)
Journal of Applied Crystallography, 30, 461466. A reprint is available as a
pdf file, Copyright © International Union of Crystallography. You should no longer use this EoS. You should use the new EoS determined by Scherdl et al (2016). If you want to convert the pressures previously determined by this EoS to the new pressure scale given by Scherdl et al (2016), download both eos files for quartz and use the pshift command in the Edit utility of EosFit7c to convert the pressures in your dataset. 


EoS of example datasets distributed with EosFit These eos files hold the results of fitting some of the example datasets distributed with EosFit7c. Details of how to fit the data and obtain these results are provided in the 'worked examples' section of the EosFit7 help system. 
Quartz 
The PV EoS for quartz (SiO2) as determined by Angel et al (1997)
Journal of Applied Crystallography, 30, 461466. A reprint is available as a
pdf file, Copyright © International Union of Crystallography. We use quartz as an internal pressure standard in singlecrystal diamondanvil cell experiments. We measure the volume of the quartz by diffraction and use this EoS to convert the measured volume to pressure. 
BirchMurnaghan 3rd order EoS K0 = 37.12(5) GPa K' = 5.99(5) 
Ferropericlase 
Equation of state obtained from the pressurevolumetemperature data (up to 2000K and 50GPa) using a BM3 EoS combined with a Bermantype thermal expansion. Beware that data have been only considered up to 50GPa (i.e. well below the spin transition).The original PVT data are taken from
Mao et al. (2011) GRL 38, L23308 
BirchMurnaghan 3rd order EoS K0 = 162(14) GPa K' = 4.1(6) dK/dT=0.018(7) GPa/K alpha0=4.0(6) x 10^5 /K, alpha1=0.1(6) x 10^8 K^2 
Kalsilite lowP Kalsilite highP 
Equations of state obtained from the pressurevolume data of kalsilite Gatta et al. (2011) Amer. Mineral. 96, 461. The two eos files are for the lowpressure and highpressure phases, seperated by a phase transition at ~3.6 GPa. 
BirchMurnaghan 3rd order EoS Low P: K0 = 60 GPa, K' = 3.5 High P: K0 = 44 GPa, K' = 6.5 


EoS useful for hostinclusion calculations For details about hostinclusion piezobarometry see:

Pyrope Grossular Almandine Spessartine 
New Garnet EoS: These PVT EoS are new determinations obtained by fitting all of the elasticity and volume data for these garnets that is published in the literature. We first used published heat capacity data to determine which published data sets are consistent, and then fitted the EoS parameters to all of those data together. These are the most internally consistent EoS that it is possible to obtain with currentlyavailable data, and they should be used for all hostinclusion calculations. The EoS are qcompromise MieGrueneisenDebye thermalpressure EoS. Therefore, in order to use the eos files, you need the June 2021 version of EosFit or a more recent version. These EoS have been implemented in the EntraPT online software For the details of how we determined these EoS, please read the open access paper Angel et al., (2022) Contributions to Mineralogy & Petrology, 177,54. 
Diamond 
Our best estimate of the PVT EoS for diamond determined from a critical review of the most recent experimental data
(elasticity, heat capacity, PV data) and DFT simulations
(Angel et al., (2014) Russian Geology & Geophysics, 56,211).

BM3MGD olivine BM4MGD olivine BM3Isothermal olivine BM4Isothermal olivine 
Our best estimate of the PVT EoS for mantle composition olivine (Fo90Fo92) determined from a critical review
and a combined fit of elasticity and volume data from singlecrystal measurements. Full details in
Angel et al., (2018) Physics and Chemistry of Minerals, 45, 95113. There are four EoS:

Quartz PVT 
This is a full PVT EoS for quartz, including the elastic softening in both alpha and beta quartz due to the alphabeta
phase transition, and a curved alphabeta phase boundary to fit all available reversals and constraints. EoS parameters
were determined by fitting simultaneously to both elastic moduli and PTV data. For details about this and the next two EoS for quartz
see Angel et al (2017) Contribs. Min. Pet., 172:29
or contact us.

Quartz V and a 
This file contains the full PVT EoS of quartz and the EoS for the acell parameter, both in Angstroms. They can be used together
to determine how the a,b,c and V of quartz change with P and T, in a selfconsistent way in the CELL utility of EosFit7c. See
Alvaro et al (2020) Geology, 48:24 and
Angel RJ, Mazzucchelli ML, GonzalezPlatas J, Alvaro M, F (2022)
A selfconsistent approach to determine unitcell parameter variations with pressure and temperature. Journal of Applied Crystallography, 54, 16211630,
which is available as a pdf file.
The PVT EoS is the same as the previous one, but with volumes in A3/cell. The EoS for the acell parameter was determined with the same transition model by fitting the same sources of data. Please reference Alvaro et al (2020) Geology, 48:24 as the source. 
Quartz PVT 
This is a full PVT EoS for quartz, including the elastic softening in both alpha and beta quartz due to the alphabeta
phase transition, but with a linear alphabeta phase boundary with slope of 240GPa/K, from Thermocalc. EoS parameters
were determined by fitting simultaneously to both elastic moduli and PTV data. From Angel et al (2017) Contribs. Min. Pet., 172:29.

Quartz PVT 
This is a PVT EoS for quartz using a model similar to that in
Thermocalc, with elastic softening only in alpha quartz.
Linear alphabeta phase boundary with slope of 240GPa/K, from Thermocalc. These EoS parameters
were determined by fitting simultaneously to both elastic moduli and PTV data and can be used with Thermocalc.
From Angel et al (2017) Contribs. Min. Pet., 172:29.

Rutile cell 
These are EoS for the cell parameters and the volume of rutile determined by fitting simultaneously to both elastic moduli and
diffraction data in the literature. Full details in a manuscript by
Zaffiro et al. (2019), Mineralogical Magazine, 83:339. The
only difference from the published paper is that these files contain the cell parameters at the reference conditions to allow them
to be used in the CELL utility.
All three EoS are loaded in one eos file. You can chose the individual eos (a, c, or V) out of the file with the load command of EosFit7c, or you can load them all simultaneously from this file into the CELL utility of EosFit7c. The EosFitGUI and calculator will automatically read the first EoS in the file, which is for the volume. You can try fitting the data yourself with the three dataset files for rutile formatted for EosFit: cell parameters and volume dataset adiabatic linear and bulk moduli at high T adiabatic bulk moduli at high P To use these data files, remove the '.txt' extension from the file name. 
Rutile MGD Rutile qcompMGD 
These are two versions of the MGD EoS fitted to the same data for rutile. One is the general form of the MGD
with a refined value of the qparameter, and the other is the qcompromise version. Both provide a very similar
PVT relationship as the 'isothermal' PVT EoS given above, but may be more reliable at more extreme P and T. For a discussion of the role of the qparameter in MGD EoS, the concept of qcompromise EoS, and a comparison of different EoS of rutile see Angel et al. (2020), Mineralogical Magazine, 84:355357. 
Spinel EoS 
This is an MGD EoS fitted to all consistent published volume and elasticty data for relatively wellordered MgAl2O4 spinel. For calculations of
volume at temperatures above 800C a correction for the effect of changes in the state of cation order is required. For full details of the data used, the
refinement of the EoS and the corrections for cation ordering, see
Hagiwara et al (2022) Contributions to Mineralogy & Petrology, 177, 108.

Zircon MGD 
This is an MGD EoS fitted to new PV and elasticity data for zircon, together with literature TV data. This EoS has been developed by
Alix Ehlers of Virginia Tech. Full details of the data and fitting are in
Ehlers et al (2022) American Mineralogist, 107, 7481.

Zircon a,c,V EoS 
These are isothermaltype EoS for the zircon volume and unitcell parameters fitted to the same datasets as described for the MGD EoS for zircon in
Ehlers et al (2022) American Mineralogist, 107, 7481.
All three EoS are loaded in one eos file. You can chose the individual eos (a, c, or V) out of the file with the load command of EosFit7c, or you can load them all simultaneously from this file into the CELL utility of EosFit7c. The EosFitGUI and calculator will automatically read the first EoS in the file, which is for the volume. The caxis of zircon is very incompressible. Therefore, in the CELL utility of EosFit7c we recommend using the EoS for the acell parameter and the volume to calculate the caxis. See Journal of Applied Crystallography, 54, 16211630 or the reprint for more details. 
Water CO2 
Fluid EoS: The equations of state of fluids are far more complex than those of solids and there are many different algebraic formulations for them. It is therefore not practical to code all of these equations into EosFit. We provide an alternative with the IMPORT utility of EosFit7c. It allows you to import a text file containing a table of volumes as a function of P and T. You can generate the text file yourself with any suitable software. The properties of the fluid are then calaculated in EosFit7c by interpolation between the table values. They cannot be used in the GUI or the calculator. Full details are given in the EosFit7 help system, in the section about IMPORT. Two examples are provided here:
To use these data files, remove the '.txt' extension from the file name. Note that the information given at the top of these two examples are not used by the release version of EosFit7c. 