Author(s)

Radia Imane Fertout, Madani Ghelamallah, Soufi Kacimi

Centre Universitaire d’A?n-Témouchent (CUAT), A?n-Témouchent, Algérie.
Laboratoire de Matériaux et Catalyse, Département de Chimie, Faculté des Sciences, Université Djillali Liabes, Sidi Bel Abbès, Algérie.
Laboratoire de Matériaux, Applications et Environnement, Département des Sciences de la Matière, Faculté des Sciences et de la Technologie, Université de Mascara, Mascara, Algérie.

Recently, lanthanum oxide doped by group IIA elements may strongly influence solid state reaction. A series of samples, noted LaSrX (where X = % atomic of strontium) have been prepared by hydrolysis, in neutral medium from La₂O₃ and SrCO₃. These samples were calcined under air at 450?C and 1150?C then characterized by specific surface area (BET), X-ray diffraction, scanning electron microscopy (SEM), thermogravimetry (TG) and differential thermal analysis (DTA). Obtained results show that after calcinations at: 1) 450?C, the addition of strontium is without effect on surface of La₂O₃ and the XRD analysis revealed no interaction between lanthanum oxide and strontium carbonate; 2) 1150?C, the sintering of the samples is very important, reduction of 70% of surfaces compared to the samples calcined at 450?C; XRD results show that LaSrX are formed principally by two oxides: SrLa₂O₄ and La₂O₃, which is confirmed by SEM method. The reaction between La₂O₃ and SrCO₃ showed three endothermic weight losses; elimination of water, a partial dehydroxylation of La(OH)₃ and formation of La₂O₂CO₃ and La₂(CO₃)₃.

La₂O₃; Strontium; Calcination; Surface; Structure; TG-DTA

R. Imane Fertout, M. Ghelamallah and S. Kacimi, "Effect of Strontium on Structure and Superficial Area of La₂O₃," Advances in Materials Physics and Chemistry, Vol. 2 No. 1, 2012, pp. 31-36. doi: 10.4236/ampc.2012.21005.