<div>sir </div>
<div>i am using quantum espresso 4.3 version</div>
<div>QHA is part of this software</div>
<div>why the phonon free energy is not coming for unstable phases (negative frequency in phonon spectrum )but it comes when there will be all positive frequency</div>
<div>for which i canot compare the gibbs free energy of two phases</div>