The Ellingham-Horton graph is a thermodynamic reference tool used in metallurgy and materials science. It provides a visual representation of the standard free energy changes (ΔG) of various metal oxides as a function of temperature. Named after the researchers Sir Harold Ellingham and J. H. Horton, the graph is primarily used to analyze the stability of metal oxides and their tendency to reduce (or be reduced to their elemental form) at given temperatures.
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