Fullerene-derived 3D carbons obtained by high-pressure treatment. (a) Structural transition of the 3D orthorhombic C₆₀ polymer from 2D polymer. Adapted with permission from ref. [38]. Copyright 2006 American Physical Society. (b) XRD pattern of the 3D fcc C₆₀ polymer crystal around the a axis. Adapted with permission from ref. [108]. Copyright 2008 American Chemical Society. (c) XRD pattern of an fcc polymeric C₆₀ phase obtained at 9.5 GPa and 550°C (λ = 0.53396 Å). Adapted with permission from ref. [109]. Copyright 2017 John Wiley and Sons. (d) Ordered C₆₀ binary-alloy-type structures including AuCuI-, CuPt-, ‘A₂B₂’- and Au₃Cu-type used to describe the 3D fcc polymer obtained at 9.5 GPa and 550°C. Adapted with permission from ref. [204]. Copyright 2019 Elsevier. (e) Simulated structures and formation of ordered amorphous carbon clusters by compressing C₆₀/m-xylene solvated crystals under different pressures. Adapted with permission from ref. [207]. Copyright 2012 American Association for the Advancement of Science.