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Ellingham diagrams are a particular graphical form of the principle that the thermodynamic feasibility of a reaction depends on the sign of ΔG, the Gibbs free energy change, which is equal to ΔH − TΔS, where ΔH is the enthalpy change and ΔS is the entropy change.
Ellingham diagram is a plot between Δ f G o and T for the formation of oxides of metals. A general reaction expressing oxidation is given by: 2xM(s) + O 2 (g) → 2M x O(s)
An Ellingham diagram is a plot of ∆G versus temperature. Since ∆H and ∆S are essentially constant with temperature unless a phase change occurs, the free energy versus temperature plot can be drawn as a series of straight lines, where ∆S is the slope and ∆H is the y-intercept.
The Ellingham diagram plots 1 the standard free energy of a reaction as a function of temperature. Originally the values were plotted for oxidation and sulphidation reactions for a series of metals, relevant to the extraction of metals from their ores (extraction metallurgy).
Learn about thermodynamic information of various reactions using the Ellingham diagram, a teaching and learning tool. Select compounds and elements, view graphs, data and activities, and construct lines for oxygen partial pressure.
Ellingham Diagram for Selected Chloride: Part-2 © 2006 S. M. Howard Data from Free Thomas B. Reed, Free Energy of Formation of Binary Compounds, MIT Press, Cambridge, MA, 1971. …………………..
The Ellingham diagram is a tool most often used in extraction metallurgy to find the conditions necessary for the reduction of the ores of important metals. This Teaching and Learning Package …
