In this section:

Defining the system

Let us imagine you want to know what are the equilibrium phases in a Fe-Cr-Ni-C system which composition would be 18/12/0.05, Fe being the balance to 100.

You type (+enter)The prompt isComments
multiphaseMULTIPHASE OPTION ? You entered the multiphase 
module (more about modules)
defineDEFINE WHAT ? You can have a look a all the possibilities by typing simply ?
sourceENTER LIST OF DATABASE NAMES : The same ? will give you the list of sources you can use (more about databases). 
plus !MULTIPHASE ? The ! marks the end of the command ( more about general command structure)

Now you can define the system in a similar way:

define system 'Fe,Cr,Ni,C' !

MTDATA goes through the different databases you selected and keeps all the phases which can be formed by the elements you gave. Because the variable [MISSING_DATA is set to CONTINUE, MT_DATA will not stop if parameters are missing, but you will find the phase initially classified as ABSENT.

Because there are not too many phases in this example, you can use them all:

classify normal p(*) !

 Here is about paraequilibrium, etc..

Settings the system conditions

We still can't do a lot. We need to set the amount of each component and the temperature. There is more than one way to do this, the easier is described: Now, just type

compute print brief print mole !

which gives you the amount and the composition of each phase present.

If you want all the possible results (gibbs energy of individual phases, mole and weight distribution tables..) type:

compute print each_stage_result !

PT-group 2003 Thomas Sourmail, Cambridge. Please email feedback !