Crystals graphite-free

Carbon Allotropes.—Thermodynamic functions of single-crystal graphite have been assessed in the t emperature range 0—3000 K.7 The experimental specific heats have been described by a computer-fitted single equation enthalpies, entropies, and free energies have also been calculated. 

For a free energy of fonnation, the preferred standard state of the element should be the thennodynamically stable (lowest chemical potential) fonn of it e.g. at room temperature, graphite for carbon, the orthorhombic crystal for sulfiir. 

Diamond is the prototype of all alijihatic compounds. One would expect on its surface free valences which are capable of surface compound formation. The surface compounds on diamond should differ somewhat in character as compared to the surface compounds on aromatic graphite or microcrystalline carbon. Apart from singly bonded carbon atoms on the edges and corners of diamond crystals... 

---