According to the relationship of cr

According to the relationship of crystallization fraction,
T and t, the curve of crystallization rate can be built by
adopting the differentiate function of Origin 8.0 software
[34]. Figure 5 shows the crystallization rates of Nd2Si2O7
as a function of temperature at 2, 5, 10, and 20 K/min,
respectively. It is seen that all of crystallization rate curves
present a similar log-normal distribution with one maximum
point. The maximum crystallization rates increase
with the increase of the heating rate. This is because the
crystallization temperature increases when the heating rate
increases (see Fig. 2). The heating facilitates the diffusion
and the grain growth [35, 36].
The activation energy for the nucleation growth of
tetragonal Nd2Si2O7 was calculated based on the exothermic
DTA data using the Kissinger equation [37] as follows