Select the compounds you wish to investigateOxides Chlorides Carbides Sulphides Nitrides
Click metallic elements on the periodic table you wish to investigate. (max 2)
After selecting the type of compound and element(s) you wish to investigate
click on 'See Ellingham diagram' button.
In addition to 2 metallic elements you may also select C and / or H.
The Ellingham diagram on the next page will show the graphs for the elements chosen.
To view the data on the right hand side of the page click on a line, then move the scrollbar slider to view data.
In addition this will display 1 or 2 other activities
(a) opportunity to view non-standard data - fill in activity of element in the blue box and press 'Enter'
(b) if an oxide system was selected then a 'Construct' button will appear. Clicking this will construct a line from (0,0) through the crosshair and indicate the partial pressure of oxygen under these conditions.
Click on the 'Construct' button to see determination of partial pressure of oxygen
Click on a line and use the scrollbar to see this data
Temperature / K
Equilibrium constant, Kc
Free energy, ΔG / kJ mol-1
pressure reacting gas,
pO2 / log bar
pH2 / pH2O
pCO / pCO2