<p>Dear PW forum,<br>
<br>
I was using the QHA code within QE-5.0.1 to calculate thermodynamic properties of Si , that is included in the Examples/ folder. From the output file Si.QHA.out, the entropy is 4.687*k_B at T=300 K (RT), which leads to a free energy of vibration of about –T*S = -0.1211 eV/atom. Isn’t this entropy too high? Even for AlAs in the Examples/ folder, this value is –T*S = -0.1756 eV/atom, which is higher than the maximum configurational entropy of an ideal solution = -0.0179 eV/atom.<br>
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Thank you<br>
Saurabh Bajaj<br>
California Institute of Technology<br>
</p>