Transformation-Mediated Kinetic Unfreezing in Mixed-Motif Amorphous Carbon

interfaces. This transformation reconstructs graphitic connectivity, releases topological constraints, and ultimately activates global atomic mobility, leading to macroscopic softening. This mechanism points to a kinetic unfreezing scenario that differs from that of conventional amorphous solids, where the structural topology is largely preserved during the dynamic process. Our findings identify mixed-motif amorphous carbon as a representative platform for transformation-mediated kinetic unfreezing and provide a structural basis for tailoring the high-temperature service window of advanced carbon materials.