Size dependent phase stability of nano-diamond
(State Key Laboratory of Automobile Materials, Department of Materials Science and Engineering, Jilin University, Changchun 130025, China)
Abstract: The transition between nano-diamond(n-D) and nano-graphite(n-G) were modeled based on the extrapolation of the bulk diamond-graphite equilibrium phase boundary in the temperature-pressure diagram to the nano-size region. It is found that in comparison with n-G, the stability of n-D increases as size and temperature decrease. However, n-D is not the most stable phase in comparison with fullerenes(C60) at the nanoscale by considering the heat of formation.
Key words: solid-solid transition; graphite; diamond; fullerenes