Crystals of New Ferric Acid Phosphate, Fe 3 H 3 (PO 4 ) 4 DT6H 2 O, Performed by Inorganic Sol-Gel Process

• Published in: Journal of inclusion phenomena and molecular recognition in chemistry 2002-06, Vol.43 (1-2), p.101-106
• Main Authors: Elyahyaoui, A, Bouhlassa, S, Maatallah, I
• Format: Article
• Language: English
• ISSN: 0923-0750
• DOI: 10.1023/A:1020461624135

Crystals of Fe3H3(PO4)4DT6H2O are obtained at room temperature and 50 DGC from phosphate gel prepared by evaporation of H3PO4 and FeX3 (X = NO3 , Cl). Optimal experimental conditions of crystal formation are defined. X-ray powder diffraction, IR absorption spectroscopy and TGA analysis are undertaken to investigate the effect of starting solution compositions on the nature and the growth of crystals.Formulation of synthesised phosphate is proposed on the basis of the composition comparison with the iron phosphate compounds formerly studied. A relation between OH group, phosphorus (or phosphate) and iron contents of the examined phosphates is found. The unit cell parameters are obtained from powder X-ray diffraction data. It is hexagonal with unit cell dimensions a = 9.114(7) A, c = 16.715(3) A and V = 1202.62 A. The BET surface area of this phosphate is measured and a value of 5.0 m/g is obtained.