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In this work we study the phase transition of the charged-AdS black holesurrounded by quintessence via an alternative extended phase space defined bythe charge square $Q^2$ and her conjugate $\Psi$, a quantity proportional tothe inverse of horizon radius, while the cosmological constant is kept fixed.The equation of state is derived under the form $Q^2=Q^2(T,\Psi)$ and thecritical behavior of such black hole analyzed. In addition, we explore theconnection between the microscopic structure and Ruppeiner geothermodynamics.We also find that, at certain points of the phase space, the Ruppeinercurvature is characterized by the presence of singularities that areinterpreted as phase transitions.

More Insight into Microscopic Properties of RN-AdS Black Hole Surrounded by Quintessence via an Alternative Extended Phase Space