High-Pressure-Induced Structural Reorganization in the High-Entropy Perovskite La(Co _0.2 Cr _0.2 Fe _0.2 Mn _0.2 Ni _0.2 )O ₃

High-entropy perovskite ceramics (HEPC) have attracted significant attention due to their unique structure and applications in energy storage and catalytic properties. The presence of numerous nonequilibrium valence states in HEPC contributes to their advantageous catalytic and energy storage capabilities. In this study, we have studied the structural stability and tunability of La(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)O3 HEPC from 0 to 51.0 GPa using in situ high-pressure synchrotron radiation X-ray diffraction. We employed scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) to analyze the microstructure morphology and valence state of samples. The results indicate the existence of substable regions in the initial HECP powder and a process of pressure-induced structural reorganization starting at 2.0 GPa. These substable regions in HEPC undergo redistribution and structural reconfiguration, eventually merging into HECP at 16.2 GPa. These findings suggest that the structure of HEPC exhibits remarkable tunability under high pressure, which could enhance the exploration of HEPC for energy storage and catalysis applications under high-pressure conditions.