Browsing by Author "Benhamideche, C."

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    The Influence Of β-pbo2 On Pzt Phase Formation
    (University of Eloued جامعة الوادي, 2013-07-01) Allal, H.; Benhamideche, C.; Bouaoud, S. E; Poulain, M.
    The reactional mechanism of the formation of solid solution lead-zircono-titanate PZT has been studied using β-PbO2, TiO2 and ZrO2 as starting materials. PZT ceramics were prepared by solid state reaction between oxides at different temperatures. After calcination samples are characterized by thermogravimetry (TGA), differential thermal analysis (DTA), differential scanning, Infrared spectroscopy and x-ray diffraction (XRD). Using lead dioxide (β-PbO2) allows PZT powder to be sintered at a temperature as low as 700°C.
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    Study Of Fluoride Glasses Devitrification-based Magnesium
    (University of Eloued جامعة الوادي, 2013-01-01) Benhamideche, C.; Boutarfaia, A.; Poulain, M.
    The kinetics of devitrification of fluoride glasses stabilized by magnesium fluoride when heated for some time between the glass transition and melting temperatures. The crystallization kinetics of AlF3-YF3-PbF2-CdF2-MgF2 glass prepared by melting the halide powders were studied by differential scanning calorimetry (DSC). The heating rate varied between 2 and 10 Kmim-1. Arami’s exponent (n) obtained by a non-isothermal method was 1.5 and 2.5 for a AlF3-YF3-PbF2-CdF2-xMgF2 (x= 0, 5, 10) and n > 2.5 for a AlF3-YF3-PbF2-CdF2-15MgF2. According to the classical interpretation of n, these magnitudes correspond to diffusion controlled growth of crystals. The activation energies for crystallization, (E), varied from 195-326 KJ/mol. These results confirm the improved stability of these glasses, which could be used as base glasses for low phonon energy fluoride glass fibers.