## - one-metal isothermal predominance area diagram
1 Metal : log10(Y)

 Y: P(As) a(B) P(Br2) a(C) P(Cl2) P(CO) P(CO2) P(F2) P(I2) P(N2) P(P) P(S2) P(Se) P(SO) P(SO2) max: min: step: value: log10(X)

 X: P(O2) max: min: step: value:

T, Kelvins:
(273 to 6000 K)

 Invariant points

Diagram

Equilibrium point

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.

 Last updated: December 6 2010 , Christopher W. Bale & Eve Bélisle www.crct.polymtl.ca - www.factsage.com