Usually, the kinetic coefficient of crystal growth, i.e. the coefficient of proportionality of the crystal growth velocity to the undercooled temperature, is supposed to be a constant parameter. In the present study we show that this assumption is valid only for low undercooling temperatures, and in general it is a function of temperature. The kinetic coefficient was found to be a linear function of the temperature of the crystal/melt interface, which becomes zero for the glass transition temperature.