Elaboration and characterization of new phosphate glasses based on natural phosphate and red clay: influence of the chemical composition on the chemical durability


  • Oumaima Jamal Eddine University Hassan II of Casablanca, Faculty of Sciences Ben MSik, Chemistry Department, LIMAT, Avenue Driss El Harti, Casablanca, Morocco
  • Mehdi El Bouchti Higher School of Textile and Clothing Industries, Laboratory REMTEX, km 8, Route d'El Jadida, BP 7731-Oulfa, Casablanca, Morocco
  • Omar Cherkaoui Higher School of Textile and Clothing Industries, Laboratory REMTEX, km 8, Route d'El Jadida, BP 7731-Oulfa, Casablanca, Morocco
  • Hassan Hannache 1University Hassan II of Casablanca, Faculty of Sciences Ben M’Sik, Chemistry Department, LIMAT, Avenue Driss El Harti, Casablanca, Morocco University Mohammed VI Polytechnic, Materials Science and Nanoengineering Department, Lot 660, Hay Moulay Rachid, Benguerir, Morocco
  • Said Gmouh University Hassan II of Casablanca, Faculty of Sciences Ben M’Sik, Chemistry Department, LIMAT, Avenue Driss El Harti, Casablanca, Morocco




New phosphate glass formulations based on Moroccan natural phosphate minerals alone or with Moroccan red clay additive (containing the P2O5-SiO2-CaO-Al2O3-MgO-Fe2O3-K2O-Na2O-TiO2 complex) have been successfully prepared by the quenching method. The chemical composition of each of the elaborated phosphate glasses was determined by X-ray fluorescence analysis (XRF). These investigated phosphate glasses have an excellent homogeneity as was verified by SEM. Their amorphous behavior was confirmed by XRD and DSC. The increase in density and glass transition temperature due to the addition of clay is believed to be related to the crosslinking of the phosphate chains. Structural investigation of these phosphate glasses was carried out using FTIR and Raman spectroscopies. The results obtained show that the composition of these glasses contains a mixture of ultraphosphate and polyphosphate structural units. The concentrations of this mixture depending on the initial composition of the glass components. A correlation between the chemical composition and the chemical durability of the investigated glasses was studied. The results showed that the dissolution rate of the glasses decreases by increasing the clay composition up to a point. This can be explained by assuming the formation of oxygen bridges and strong bonds within the various glasses.


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Materials Chemistry