http://dspace.univ-setif.dz:8888/jspui/handle/123456789/255 2026-09-10T22:48:58Z 2026-09-10T22:48:58Z Lidjici, C. Hobar, F. Rguiti, M. Trelcat, J-F. Courtois, C. Leriche, A. http://dspace.univ-setif.dz:8888/jspui/handle/123456789/295 2015-03-25T11:42:53Z 2011-01-01T00:00:00Z

Titre: EFFECT OF POLING CONDITION ON THE PIEZOELECTRIC PROPERTIES OF 0.935(Bi0.5Na0.5)TiO3- 0.065BaTiO3CERAMICS Auteur(s): Lidjici, C.; Hobar, F.; Rguiti, M.; Trelcat, J-F.; Courtois, C.; Leriche, A. Résumé: In this study, the effect of poling conditions on the piezoelectric properties of 0.935(Bi0.5Na0.5) TiO3-0.065BaTiO3(BNT6.5BT) lead free ceramics was examined. The piezoelectric properties like piezoelectric constant (d33 ) and electromechanical factors (Kp,K t ) depend on poling field and poling temperature, while no remarkable effect of the poling time on the piezoelectric properties was detected in the range of 5-30 min.

2011-01-01T00:00:00Z Hamzioui, L. Boutarfaia, A. Kahoul, F. http://dspace.univ-setif.dz:8888/jspui/handle/123456789/292 2015-03-25T11:42:35Z 2011-01-01T00:00:00Z

Titre: Effect of phosphorus pentoxide addition on the microstructure Auteur(s): Hamzioui, L.; Boutarfaia, A.; Kahoul, F. Résumé: We can note that the sintering temperature of the piezoelectric Pb0.98Ca0.02[(Zr0.52Ti0.48)0.98 (Cr 3+ 0.5, Ta 5+ 0.5)0.02]O 3 can be reduced after the addition of phosphor without compromising the dielectric properties. A sintered density of 96 % of the theoretical density was obtained for 4 wt. % P2O5addition after sintering at 1050 °C for 2 h. Ceramics sintered at 1050 °C with 4 wt. % P2O5achieve excellent properties, which are as follows: εr = 18808, tan δ = 0.0094 and Tc = 390°C.

2011-01-01T00:00:00Z Baccour Zghal, H. Medhioub, M. Mhiri, T. http://dspace.univ-setif.dz:8888/jspui/handle/123456789/290 2015-03-25T11:41:44Z 2011-01-01T00:00:00Z

Titre: Caractérisation physicochimique et mécanique de matériaux céramiques obtenus à partir des argiles Tunisiennes Auteur(s): Baccour Zghal, H.; Medhioub, M.; Mhiri, T. Résumé: This study concerns the determination of the phase composition and physical properties as well as mechanical properties of fired products of two samples clays A1and A2,the most representative, taken from clay dominated formation in southern Tunisia. For temperatures up to 900°C, the products have high values of apparent porosity, which lead to low bulk density ceramics having low mechanical resistance. Above 900°C and up to 1200°C, the obtained products show the presence of mullite and cristobalite, the ceramics are dense and have high mechanical resistance, without deformation or defects. These clay materials may be used for the production of terracotta products and also for the formulation of low porosity ceramics.

2011-01-01T00:00:00Z Belhouchet, H. Garnier, V. http://dspace.univ-setif.dz:8888/jspui/handle/123456789/288 2015-03-25T11:42:01Z 2011-01-01T00:00:00Z

Titre: Characterization of mullite-zirconia composites prepared from various starting alumina phases Auteur(s): Belhouchet, H.; Garnier, V. Résumé: Zirconia-dispersed mullite composites were prepared by reaction sintering of boehmite, γ-alumina, (δ+θ)-alumina and α-alumina as sources, mixed with zircon powder. The powder mixtures were ball-milled and isostatically pressed into disks. The obtained samples were sintered between 1400 and 1600°C for 2h in air. The resulting sintered materials were characterized in terms of bulk density, dilatometry, DTA/TG, XRD and SEM. From the dilatometric and differential thermal analysis curves, several microstructural transformations which occur in these samples are detailed in this work. XRD peaks suggested fully developed mullite and zirconiaphases by reaction sintering of zircon and all alumina phases. Zircon usually dissociates attemperature higher than 1665°C. However, it is shown in this study that zircon dissociates at about1400°C due to the presence of transition alumina phases. The microstructure of all the composites is composed of irregularly shaped mullite grains, and round-shaped zirconia grains which are distributed intragranularly and intergranularly.

2011-01-01T00:00:00Z