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A phase diagram is a graphical representation of the equilibrium between different phases in a material system under varying conditions of Phase equilibrium: minimum energy for a system with multiple phases Phase diagram: information about phases as function of T, composition, and pressure A maximum concentration of solute Background, tutorials, and FAQ for the Phase Diagram App on the Materials Project (MP) website. They show the mixture of phases present in thermodynamic equilibrium. It defines key terms like solid solutions, Hume-Rothery rules, phase This work presents a primer on “How to Read and Apply Phase Diagrams” in the current environment of powerful thermodynamic software packages. 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