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Abstract

In this paper, we systematically study the thermodynamic properties and P-v criticality of the RN-AdS black hole surrounded by PFDM in the framework of the extended generalized uncertainty principle (EGUP). In the extended phase space, starting from the first law of black hole thermodynamics, the EGUP-corrected Hawking temperature, heat capacity, and entropy are derived. Then, we use graphical methods to analyze the effects of the EGUP parameters on these thermodynamic quantities. Analysis of the heat capacity indicates that the EGUP correction is beneficial for maintaining the thermodynamic stability of black holes. Finally, based on the modified thermodynamic quantities, we obtain the EGUP-corrected black hole equation of state and Gibbs free energy. The G-T diagram with the EGUP correction effect is analyzed, and the results show that when $P<P_c$, a ``swallowtail'' behavior emerges, indicating that the black hole undergoes a first order phase transition. The position of the phase equilibrium point changes slightly as the EGUP parameters increase. For the cases of $P=P_c$ and $P>P_c$, we combine the analysis of the relationship between heat capacity and event horizon radius, finding that the phase transition characteristics depicted in the G-T diagram are similar to those without the correction effect.