Preparation of Forsterite (Mg2SiO4) Powders Via an Aqueous Route Using Magnesium Salts and Silicon Tetrachloride (SiCl4) |
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| Authors: | Mitchell Matthew BD Jackson David James Peter F |
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| Institution: | (1) Department of Engineering Materials, University of Sheffield, Sir Robert Hadfield Building, Mappin St., Sheffield, S1 3JD, UK;(2) Zortech International, Hadzor Hall, Hadzor, Droitwich, Worcestershire, WR9 7DJ, UK |
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| Abstract: | Forsterite (Mg2SiO4) powders were prepared by mixing SiCl4 with aqueous solutions of either Mg(CH3COO)2·4H2O or Mg(NO3)2·6H2O and heating the powdered gel. The powders were characterised using thermal analysis (DTA and TGA), X-ray diffraction (XRD), nitrogen adsorption surface area analysis (BET) and transmission electron microscopy (TEM). On heating, MgO and enstatite (MgSiO3) were observed in addition to forsterite. On heating to 1200°C, forsterite was the dominant phase in the powders produced from Mg(NO3)2·6H2O, and MgO was the dominant phase in the powders produced from Mg(CH3COO)2·4H2O. The primary particle sizes of these powders were between 100 and 500 nm, which remained the same on heat treatment. However, higher temperatures gave rise to an increase in the size and densities of the agglomerates of primary particles. |
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| Keywords: | forsterite SiCl4 powders enstatite |
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