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Alkalinity Effect on Characteristic Properties and Morphology of Magnesium Phosphate Hydrates

  • SYNTHESIS AND PROPERTIES OF INORGANIC COMPOUNDS
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Abstract—

Magnesium oxide (MgO) and orthophosphoric acid (H3PO4) have been reacted at different pH values to study the effects of alkalinity on the characteristic features of magnesium phosphate material. The phases of the synthesized samples have been identified as newberyite (with the chemical formula of MgHPO4 ⋅ 3H2O and the pdf no. 01-075-1714) and magnesium phosphate hydrate (with the chemical formula of Mg3(PO4)2 · 22H2O and the pdf no. 00-044-0775), in the X-ray powder diffraction analyses results. The characteristic band values of samples have been characterized by FTIR and Raman spectroscopies. The differences in morphologies have been studied with Scanning Electron Microscope (SEM). The largest particles in the range of 3.16–9.85 µm have been seen in the shape of nested flat sheets at pH 10 while the smallest particles between 1.17–2.04 µm have been obtained in the shape of an ellipse at pH 7. According to the thermogravimetric analyses, the differences in thermal behaviours have been determined. MgHPO4 · 3H2O has lost its crystal water by a two-step reaction while Mg3(PO4)2 · 22H2O has dehydrated by a single-step reaction. Obtained results indicate that the crystal structure and surface morphology of the synthesized compound can be modified by the alkalinity of the reaction medium.

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Authors and Affiliations

  1. Department of Civil Engineering, Nisantasi University, 34375, Istanbul, Turkey

    F. T. Senberber

  2. Department of Chemical Engineering, Yildiz Technical University, 34349, Istanbul, Turkey

    E. Moroydor Derun

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  1. F. T. Senberber
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Senberber, F.T., Moroydor Derun, E. Alkalinity Effect on Characteristic Properties and Morphology of Magnesium Phosphate Hydrates. Russ. J. Inorg. Chem. 65, 1326–1332 (2020). https://doi.org/10.1134/S0036023620090156

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