Worked Example

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Pcell _hexagonal dataset:


These data are taken from Gatta et al. (2011). This is an example of an isothermal compression study of a mineral showing a iso-symmetric first order phase transition a little above 3.6GPa 


See Pcell_hexagonal for further details about this dataset.


Here below a graphic worked example that illustrate the main features of the program guiding you through the 6 steps for a basic elasticity analysis.





(1) Opening a datafile: To follow the example open the 'Pcell_hexagonal.dat' file that is included in the distribution package.





(2) Plotting the data: Click on the volume tab to see the plot of the data.




(3) Setting data groups: If you have no phase transitions/multiple samples in your data, and do not want to divide the data in to groups, you don't need to set groups. All data go to group 1 by default.





(4) Set up the refinement: Here the procedure is shown only for data in group one. After you are done with the refinement of the data from group 1 you need to click on the button EoS2 and repeat steps 3 to 10 for group 2 as well. At the end of the refinement for each group is strongly recommended to save the *.eos file by clicking on the 'save eos button'   (N.B. the .eos file can also be read in Eosfit7 GUI)





(5) Change plot type: as shown below we are changing the plot type to display the f-F plot for both the groups of data. You can repeat the same step to change plot to display V/V0, K0, Kp, Pobs - Pcalc etc..  as a function of pressure.



       


(6) Plot confidence ellipses: Click the 'VCV' tab to display the confidence ellipses and follow the steps to activate the plot of both the EoS available, then you can change the variables to plot on the X and Y axis as well as the confidence level (in sigma units)