This will help to better visualize the structural phase transitions that occur in ammonium nitrate. It is believed that the actual temperature of this transition is 55 o C, which is observed in case of perfectly anhydrous ammonium nitrate and this temperature is lowered continuously by an increasing amount of moisture. Since nitrate is very hygroscopic in nature and in tropical countries, like India, the normal temperature fluctuates widely around 32 o C, caking of ammonia nitrate as well as of the fertilizers containing this compound is very much facilitated in these zones. The transitions which occur in ammonia nitrate crystals arise from orientational disorder. Transitions are sluggish, and their occurrence and characteristics depend on how dry the sample is and on its thermal history.
T is the temperature defined at each peak maximum.
T is read directly from the plot. The TGA curve for ammonium nitrate is shown in Figure 6 . Discuss the above in detail. Seal the sample pan and place in appropriate space on instrument. Return to computer and press F1 to start analysis.