Principle of synthetic diamond

From the thermodynamic point of view, the decision of graphite and other non-diamond structure carbonaceous material into a diamond can transition condition that the

latter must be less than the free energy of the former. This phase transition at high pressure, high temperature or other components under the conditions of

participation.

Certain amount of pressure, temperature and component concentration of the internal energy of the system can be changed, so that the energy level of the valence

electrons at statistical weight change accordingly. This may be electron transfer and formation of a new state of the electronic structure of bonding, a phase

transition occurs. As

If the system in favor of energy change occurs in the solid structure of the electron is changed, the high temperature phase transition occurs in the solid state, or

may occur in the molten state or vapor state. This change occurred in the melt condition that the bonding characteristics of the statistical distribution of the

valence electron right

Weight reduced accordingly, the role of the remote order tend to disappear coordination number is changed; the electronic excited state statistical weight tends to

increase, the role of short-range ordered increased accordingly. This change occurred in the gas condition is sometimes elemental atom bonded compound

Intermolecular electron energy levels tend to disappear, all electronic transfers to a single atomic or molecular level up, so that electrons in the excited state is

more statistical weight increases. Accordingly, synthetic diamond can be solid, but also may be in the melt state and the vapor state conditions, depending

The pressure, temperature and component concentration and other factors can cause changes in the system. From the kinetic point of view, but also requires a

carbonaceous material such as graphite into diamond with an appropriate transition rate. The synthetic diamond powder nucleation rate and the growth rate is maximum when both

Phase-change rate Max.