http://dspace.univ-setif.dz:8888/jspui/handle/123456789/314 2026-07-26T06:31:42Z http://dspace.univ-setif.dz:8888/jspui/handle/123456789/342 Titre: Chemical preparation crystallographic characterization and vibrational study of two new condensed phosphates Auteur(s): Tridane, M.; Kheireddine, A.; Fahim, I.; Moutaabbid, H.; Moutaabbid, M.; EL. M. Tace; Charaf, A.; Radid, M.; Salhamen, F.; Benmokhtar, S.; Belaaouad, S. Résumé: Chemical preparation, crystallographic characterization and vibrational studies are reported for two new condensed phosphates associated to nickel-rubidium NiRb4(P3O9)2 and strontium-thallium SrTl4(P3O9)2. SrTl4(P3O9)2 was prepared by the method of ion-exchange resin and NiRb4(P3O9)2 was obtained by total thermal dehydration of NiRb4(P3O9)2.6H2O. SrTl4(P3O9)2 is rhombhoedral , Z = 2, space group P-31c, with the following unit-cell parameters : a = 7,424(1) Å, c = 20,176(2) Å and V = 2807.46(2) (Å 3 ). NiRb4(P3O9)2 is triclinic, Z = 2, space group P-1, with the following unit-cell parameters : a = 8,046(9) Å , b = 9,733(0) Å, c = 4,327(5) Å, α = 98.053°, β = 88.616°, γ = 84.761° and V = 333,95(2) (Å 3). Vibrational study is also reported for the title compounds. 2015-01-01T00:00:00Z http://dspace.univ-setif.dz:8888/jspui/handle/123456789/340 Titre: Etude des propriétés mécaniques d’un matériau bio-composite polyeoxymeyhylene farine de bois Auteur(s): Latreche, L.; Haddaoui, N. Résumé: On a étudié les propriétés mécaniques d’un composite formé par l’incorporation d’une charge végétale la farine de bois locale des régions de l’est Algérien dans la matrice du polyoxyméthyléne (POM). On a observé une augmentation de certaines propriétés comme le module d’élasticité et la dureté, au détriment des autres comme la résistance au choc et l’allongement à la rupture 2015-01-01T00:00:00Z http://dspace.univ-setif.dz:8888/jspui/handle/123456789/338 Titre: Synthèse et étude structurale d’une nouvelle phase (1-x)BiO1.5-(x/4)Ta2Te2O9 (x=0.1, 0.2), TYPE δ-Bi2O3 Auteur(s): Loubbidi, L.; Chagraoui, A.; Orayech, B.; Naji, M.; Tairi, A.; Moussaoui, A.; Ait Sidi Ahmed, O.; Yakine, I.; Igartua, J.M. Résumé: Two compositions (1-x)BiO 1.5-(x/4)Ta2 Te 2O9 with (x=0.1, 0.2) were taken within Bi2O3-Ta 2O5-TeO 2 system. X ray diffraction analysis shows that they are isotypes δ-Bi2O3 phase. The pattern refinement of the composition (x=0.2) was carried out by means of the Rietveld using the FULLPROF program [1]. It crystallizes in the cubic unit cell, space group Fm-3m and a lattice parameter a = 10.49 Å. The reliability factors are RF = 2.275% and RB = 3.033%. 2015-01-01T00:00:00Z http://dspace.univ-setif.dz:8888/jspui/handle/123456789/336 Titre: Synthèse de nanoparticules de phosphate tricalcique β par voie aqueuse Auteur(s): Massit, A.; Yacoubi, A.; Chafik El Idrissi, B.; Yamni, K. Résumé: The Ca3(PO4)2 (β-TCP) can be obtained by the calcination above 750°C of the apatitic tricalcium phosphate Ca9(HPO4)(PO4)5 OH (Ap-TCP). The β-TCP is of great interest in the field of bone replacement. However, the use of β-tricalcium phosphate is limited by the difficulty of the synthesis as a pure compound. The calcium/phosphate molar ratio must be 1.500. Nanoparticles of β-TCP were synthesized by wet precipitation method in aqueous phase. The size of the crystallites is closed to 40 nm. The two powders, dried at 60°C and calcined at 800°C were characterized by using X-ray diffraction (XRD), infrared Fourier transform (FTIR) spectroscopy, thermogravimetric analysis (DTA / TG) and the inductively coupled plasma spectrometry (ICP AES). 2015-01-01T00:00:00Z