Extended Data Fig. 8: Enthalpy and volume as a function of temperature during the heating treatment of C60 at 30 GPa. | Nature

Extended Data Fig. 8: Enthalpy and volume as a function of temperature during the heating treatment of C60 at 30 GPa.

From: Synthesis of paracrystalline diamond

Extended Data Fig. 8

The decrease of enthalpy with increasing temperature (500–1250 K) indicates the main sp2-sp3 transition (25% to 70% as shown in Extended Data Fig. 7a) occurs between 500 K and 1250 K, accompanied by the densification of the material due to the formation of sp3 bonding. The uprise of the enthalpy at temperatures below 500 K and above 1250 K is mainly due to the thermal effect.

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