The superphosphate thin film of Fe 3 (NH 4 )H 8 (PO 4 ) 6 .6H 2 O is electrodeposited using a concentrated solution of 2 M phosphoric acid and a Mohr's salt precursor (Fe(NH 4 ) 2 (SO 4 ) 2 .6H 2 O). The electrochemical oxidation of the Fe(H 2 PO 4 ) + complex present in the medium is monitored by cyclic voltammetry and shows that the deposition results from a combination of different phenomena such as diffusion and adsorption. The electrodeposition is carried out using the chronoamperometric method at a potential of 0.6 V/saturated calomel electrode. The resulting material is studied by X‐ray diffraction and has a hexagonal structure corresponding to the P31c space group, with lattice parameters of a = 9.15 Å and c = 16.86 Å; its morphology is studied by scanning electron microscopy combined with energy dispersive X‐ray spectroscopy, which shows a rod structure and confirms the presence of its constituent elements. Fourier transform infrared spectroscopy reveals lattice vibration bands, associated with (PO 4 ) 3 − ions and water molecules. Meanwhile, thermogravimetric analysis and differential scanning calorimetry indicate water loss at around 187 °C.
Moufakkir et al. (Thu,) studied this question.
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