I was trying to understand some indicators about the stability of materials (that basically tell you whether it can be synthesized or not.. right?).

Specifically, I'm trying to link the knowledge of formation energy and energy above convex hull.

Can you explain me a little better and eventually make some examples of value ranges for these two parameters (formation energy and energy above convex hull)?

I'm asking because I'm trying to put up some datasets to work with but still have little domain knowledge.



Basically, convex hull is a plot of formation energy with respect to the composition which connects phases that are lower in energy than any other phases or a linear combination of phases at that composition. Phases that lie on the convex hull are thermodynamically stable and the ones above it are either metastable or unstable. This plot can only give an idea about the stability of the structure at 0 K. Higher temperature calculation (Phonopy is one of the codes) can assure the stability of the given structure at the working temperature (mostly greater than 0 K).

Hope it helps.


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