Ammonium dihydrogen phosphate (ADP) (NH4H2PO4) single crystals were grown by slow evaporation method using doped 0.8% L-Leucine. The X-ray diffraction analysis of the as–grown ADP crystals showed that it possesses tetragonal structure having lattice parameters a = 7.4854 Å and c = 7.5377 Å. The Fourier transform infrared spectroscopy (FTIR) of as-grown ADP crystal taken between wave-number 400 to 4000 cm-1 showed peaks due to vibration and stretching of functional group O-N=P and –ONO2 in 400 to 912.16 cm-1, P = O and O-H in 1100.50 to 1446.67 cm-1 and O-H and N-H in 2409.81 to 3253.71 cm-1 range. The thermal properties of the as-grown ADP crystals were studied by thermogravimetric analysis (TGA). The thermal activation energy determined from the TGA curve using Broido, Piloyan-Novikova (PN) and Coats Redfern (CR) relations were in good agreement with each other and Energy Dispersive X-Ray Analysis (EDX),. The obtained results are discussed in details
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