Thermodynamics and Phase transition of the Reissner-Nordstr\"om Black
  Hole surrounded by quintessence
  We investigate thermodynamics and Phase transition of the
Reissner-Nordstr\"om black hole surrounded by quintessence. Using
thermodynamical laws of black holes, we derive the expressions of some
thermodynamics quantities for the Reissner-Nordstr\"om black hole surrounded by
quintessence. The variations of the temperature and heat capacity with the
entropy were plotted for different values of the state parameter related to the
quintessence, $\omega_{q}$, and the normalization constant related to the
density of quintessence $c$. We show that when varying the entropy of the black
hole a phase transition is observed in the black hole. Moreover, when
increasing the density of quintessence, the transition point is shifted to
lower entropy and the temperature of the black hole decreases.
