Ellingham diagram

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What Wikipedia says

An Ellingham diagram is a graph showing the temperature dependence of the stability of compounds. This analysis is usually used to evaluate the ease of reduction of metal oxides and sulfides. These diagrams were first constructed by Harold Ellingham in 1944.

Excerpt from the Wikipedia article “Ellingham diagram”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: DerSilberspiegel, CC BY-SA 4.0, via Wikimedia Commons.