Click on Download
Predom Slide Show (pdf presentation - 34 pages) for
detailed information on the Predom
module enables you to calculate and plot isothermal predominance
area diagrams for one-, two or three-metal systems using
data retrieved from the compound databases.
For example, Fig. 2 shows the entry and
resulting diagram for the one-metal Cu-Pso2-Po2 system
at 1000 K. After the components (Cu, S and O) have been
specified, the user is presented with a list of possible
axes, log10X and log10Y (X and Y are pressure or activity
of S, S2, …Sn, SO, SO2, SO3, O2 etc.), and possible
product species (gases, solids, liquids – these
may be edited by clicking on the “List” button).
A useful feature of the module is the option to include
the calculated total pressure isobar on the predominance
diagram (plotted as “+”s in Fig. 2). Along
such an isobar the total pressure is the sum of the partial
pressures of all the gaseous species (in Fig. 2, P(total)
= 1 atm = Ps + Ps2 + … Psn + Pso + Pso2 + Pso3 +
Po2 + Pcu … etc.). Such a line represents the reaction
path whereby, for example, Cu2S oxidizes to, say, Cu2O.
3. shows the effect of temperature on the Cu-Pso2-Po2
Fig 4. displays the calculated diagram and invariant points
of Fe-Pso2-Po2 at 1000 K. A detailed point calculation
at Pso2 = 0.8 atm and Po2 = 0.2 atm is presented in Figs
5 and 6.
calculated diagrams can be stored as figure (*.fig) files,
edited by the Figure
module, and exported as *.bmp, *.emf and *.wmf files.
also enables you list the coordinates all the invariant
points as well as perform detailed equilibrium calculations
at any point on the diagram.