A sol-gel method based on (H 2 S 2 O 5 ) aq as silicon precursor in the presence of NaCl and KCl mineralizers was used for the synthesis of the classical cobalt olivine (Co 2 SiO 4 ) ceramic pigment. The effect of this synthesis route on the colour properties was studied. Highly pure olivine phase was obtained after firing at 1200 • C for 3 h. The resulting powders exhibited very intense violet colour, while their addition at only 1 wt% to an industrial transparent glaze was enough to produce a very intense blue-violet colouration. Based on the aspect of glazed ceramics, addition of pigments even at 0.5 wt% to the glaze resulted in a very interesting colour and opacity. By this appropriate minimization of the used pigment amount without compromising the colouring properties required during application, the obtained Co olivine could be more efficient, less toxic and less expensive.
Forsterite single phase powder Mg2SiO4 was synthesized by sol-gel method alongside with heat treatment, using two different cations alkaline salts MCl as mineralizers (M=Na, K) with various mass percentages (2.5, 5, 7.5, and 10wt %). In this work we report on the effect of the cation type and the added amount of used mineralizer on microstructure and electrical conductivity of Mg2SiO4. The formation of forsterite started at 680-740°C and at 630°C–700°C with KCl and NaCl respectively, as shown by TG-DTA and confirmed by XRD. Furthermore, the Fourier transform infrared (FTIR) absorption spectra indicated bands vibrations of forsterite structure. The morphology and elemental composition of sintered ceramics were examined by SEM-EDX analyses, while their densities were measured by Archimedes method which increased with addition of both alkaline salts. The electrical measurements were performed by Complex Impedance Spectroscopy and the results showed that electrical conductivity increased with the addition of both mineralizers, which was higher for samples prepared with NaCl than those prepared with KCl.
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