The thermogravimetric curve obtained for gel grown ADP in inert atmosphere is shown in Figure 7. The curve clearly shows that the ADP crystal is stable between the temperature range of ambient to 473 K (the melting point of ADP). Above 473 K to 873 K, the weight loss in total is of ∼ 80%. The maximum weight loss in one step (473 K to 523 K) is ~63%. The activation energy calculation using this weight loss in temperature range 473 K to 523 K was carried out using Broido, Piloyan-Novikova (P-N) and Coats-Redfern (C-R) relations[14]. The plot of Broido, Piloyan-Novikova (P-N) and Coats-Redfern (C-R) is shown in Figure 8. The activation energy obtained from the plots of these three re-lations is tabulated in Table 1. The values are in good agreement with each other.