Articles
  • Temperature effect on the structural and the optical properties of sol gel CdTiO3 nanopowders
  • Radouane Bahloula, Salaheddine Sayourib,*, Karoum Limamea,b, M. Mustapha Yahyaouia, Boujamaa Jaberc and Larbi Laanabd
  • a Laboratoire de Physique Théorique et Appliquée, FSDM, B.P. 1796, Fès-Atlas, Fès. Morocco b Centre Régional des Metiers de l'Education et de la Formation (CRMEF) de Fès, rueKuwait, B. P. 49, Fès. Morocco c Centre National pour la Recherche Scientifique et Technique (CNRST), Angle Avenue Allal El Fassi avenue des FAR, Quartier Hay Ryad, B. P. 8027 Nation Unies Rabat Morocco d Laboratoire Conception et Système (LCS), Faculté des sciences Rabat, 4 Avenue Ibn Battouta, B.P. 1014 RP, Rabat Morocco
Abstract
Sol gel processed cadmium titanate (CdTiO3) ceramic has been characterized by X-ray diffraction (XRD), infrared (IR) and Raman techniques. The results confirm that CdTiO3 crystallizes in the pure hexagonal ilmenite phase at 900 oC and undergoes a transition to the pure orthorhombic structure above this temperature. Furthermore, it was showed that a post-annealing at the temperature of 1100 oC leads to a transition to a new phase with Pbn21 as space group, with the following lattice parameters: a = 5.30 Å, b = 5.43 Å and c = 7.57 Å. UV-Vis spectroscopy results show that CdTiO3 band gap energies are strongly affected by the crystallite size and structural properties. The obtained band gap values of ilmenite and perovskite phases are higher than those reported in the literature, whereas that of Pbn21 is slightly lower than that related to Pbnm, probably due to the distortion of Pbnm structure or to the presence of TiO2 structure.

Keywords: CdTiO3, Sol-gel, Ilmenite, Perovskite, Diffuse reflectance.

This Article

  • 2017; 18(4): 329-335

    Published on Apr 30, 2017