Diagram Example :At a Constant Temperature 2a

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Diagram : The chemical potential diagram for the Ca-C-O system at 1000 K.

1. Diagram : The three dimensional diagram in the μ(Ca)-μ(C)-μ(O) plot.
   
   
   
   
2. Description of Diagram Example : At a constant temperature (2a)
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   • In the Ca-C-O system, 6 phases appear at 1000 K; namely, Ca, C(graphite), CaC₂, CaO, CaCO₃, and CaO₂.
     
   • The planes for respective stable phases are all flat in the diagram. The slope of the plane indicates the stoichiometric number.
     
   • The three plane junction gives a point in the chemical potential space. The three phases form a convex vertex. The different slopes of three planes correspond to different compositions of respective phases.
     
   
   
3. Detailed procedure for reproducing Diagram Example At a constant temperature (2a)
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   1. [System] MALT

      Search Compounds

   Selection of <Ca,C,O> system

   2. Project > Chemical System

   3. [Chemical System] dialog
      
      • [Select Compound] page
        
        Selection by Default
        
        x Condensed phases
        o Respective Gaseous Species
        o Gaseous mixture
        

   4. Project > Specify Diagram

   5. [Diagram Specification]Dialog Main part
      
      • (1) Dimension SelectionPage
        
        Temperature
        
        x Fixed at 1000 K
        o Not Fixed
        
        Pressure
        
        x Fixed at 1 atm
        o Not Fixed
        

   6. Run > Calculation

   7. Diagram > Rotation

   8. [Rotation of 3D diagram] Dialog
      X-axis
      
      Horizontal 100 => 40
      Vertical 0 => -15
      
      Z-axis
      
      Horizontal -50 => -50
      Vertical -20 => -80
      
      As a result, the following matrix values are obtained
      
      0.4 0.0 -0.5
      -0.15 1.0 -0.8