What is ellingham diagram?

An Ellingham diagram is a graphical representation of the Gibbs free energy, standard enthalpy, and standard entropy of formation reactions. It is a tool used to predict the stability of metal oxides and other compounds at high temperatures. The diagram plots the ΔG° of the reaction versus temperature and shows the metals that have a lower line of ΔG°, which means they are more stable at high temperatures. The diagram is useful in predicting the reduction conditions for a given metal oxide and the production of impurities during the reduction process. It also helps to predict the solubility of metal oxides in different environments, such as in acidic or basic conditions. Overall, the Ellingham diagram is a valuable tool for metallurgists, materials scientists, and chemists who work with high-temperature reactions involving metal oxides.