[Pw_forum] About F_QHA.x

Yamit amit99266 at rediffmail.com
Mon May 24 15:01:11 CEST 2010


Dear All

I have attempted to calculate the specific heat of Si using "F_QHA.x", and the calculated Silicon phonon dos  as an input.
(The calculated Si phonon frequencies are in excellent agreement with available experimental data. )

As the output of "F_QHA.x", I have obtained the following results, (in QHA.out file)

############################################################################################################

# T in K, F_vib in Ry/cell, C_v in R (the universal gas constant by 3N modes), S in k_B
############################################################################################################
#   T         E_internal        F_vibration          Specific heat (C_v)       Entropy
############################################################################################################
:
:
  295.00      0.0139740852      0.0055747646           4.6621714979          4.4956255367
 300.00      0.0141222695      0.0054311560           4.6966380876          4.5742737931
 305.00      0.0142715257      0.0052850687           4.7298757363          4.6521815403
 310.00      0.0144218157      0.0051365259           4.7619351485          4.7293532915
:
:
:
############################################################################################################



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