particles e.g. connecting bonds. In this approach melting of an amorphous material occurs, when the broken bonds form a percolation cluster with T_g dependent on quasi-equilibrium thermodynamic parameters of bonds e.g. on enthalpy (H_d) and entropy (S_d) of formation of bonds in a given system at given conditions:

where f_c is the percolation threshold and R is the universal gas constant.

Although H_d and S_d are not true equilibrium thermodynamic parameters

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