- one-metal
isothermal predominance area diagram
Instructions:
Select a metal, specify a temperature (within the range 273 to 6000
K), select the axes and specify their limits (make sure min <
max). The step defines the position of the labels on the axes. The
default system is Cu-SO2-O2 at 1000 K. Click
on Calculate to generate the diagram.
Predom-Web
generates an isothermal predominance area diagram that shows which
possible compound phases are most stable over the specified ranges
of the axes. Data are taken from the 
compound (i.e. pure substances) database. The '+' line on the resulting
diagram corresponds to the P(total) = 1 atm isobar. That is, along
this line the sum of the partial pressures of all the gaseous species,
P(O2) + P(O) + P(O3) + P(S) + P(S2)
+ ... P(Sn) + P(SO) + P(SO2) + ..., is 1 atm in the case
of the default system Cu-SO2-O2. On the diagram,
P(total) > 1 atm above the '+' line, and P(total) < 1 atm
below the line.
Here
you are limited to 1 metallic element and a small selection of axis
variables. In the complete Predom
module of the 
package, your may enter up to 3 metallic elements (to produce a
multi-metallic system) and any selection of axis variables. Species
may be dropped from the calculation, and the activity or partial
pressure of any compound phase may be set to a value other than
unity. The total pressure isobar may also be any value. In addition
to the calculated diagram it is possible to list a table of invariant
points, and perform a detailed chemical equilibrium calculation
at any coordinate on the diagram. Additional constant chemical potentials
may also be specified.
You can
also generate predominance area diagrams in the Phase Diagram module
of FactSage where you can also include non-ideal solutions (slags,
alloys, molten salts, mattes, ceramics, etc.) taken from the ,
SGTE and private solution databases.
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