Free energy correction

[shyuep]

Feature Requested

With the advent of universal machine learning potentials (MLPs), we now have the capability of generating free energy corrections such as vibrational entropy at specific temperatures. This allows the generation of finite temperature phase diagrams.

Proposed Solution

I propose to implement a FreeEnergyCorrection in pymatgen.entries. Given this serves a different purpose from the current corrections, it should be in a different module (e.g., pymatgen.entries.thermodynamics. These FreeEnergyCorrections can be applied to a set of ComputedEntries and then used to generate the finite T phase diagram without any other code changes.

@rul048 will implement.

Relevant Information

See https://github.com/materialsvirtuallab/matcalc on how to obtain phonon corrections with MLPs.