When you mention phase transition, are you referring to a change in the crystal structure of the ammonium nitrate? Ammonium nitrate does not melt by itself until 170°C, so I think you have to be referring to a change in the crystal structure. The only crystalline phase transition I can see around that temperature is to and from the rhombic phase. But, the rhombic phase should be stable up to >80°C by itself. Is this coating process in a solvent and does that solvent affects the transition? Also, when you mention coating performance, what type of performance are you evaluating? I think more information is needed to try and assess what could be occurring in your coating process. If you can provide additional information, I will try to see if I can be of more assistance.
Dear Dr. Brenda thank you very much for your concerning
Yes phase transition referring to a change in the crystal structure of the ammonium nitrate
the coating process in solvent medium at 60 oC, but ammonium nitrate insoluble in this solvent .
the coating performance of anti-hygroscopicity and this coating will be homogeneous and uniform on surface of ammonium nitrate
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