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.
This work aims to investigate the effect of sintering temperature and iron doping on the electrical conductivity of forsterite in the temperature range of 300-400°C. For this purpose, olivine compositions (Mg2-xFexSiO4; x=0, 0.05 and 0.1) were synthetized by sol-gel process and then characterized by different techniques. The obtained results indicate the successful formation of dense single phase olivine ceramics. It was also found that Fe inserted in forsterite lattice has both Fe (II) and Fe (III) oxidation states. Regarding the electrical conductivity, it turned out to be more sensitive to both investigation parameters, in contrast with the activation energy characterizing the diffusion of carriers charge responsible of electrical conductivity. The prepared samples were characterized by: XRD, SEM techniques and Raman, Mössbauer and Impedance spectroscopies.
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