Articles
  • A new synthesis technique and structural, microstructural and dielectric properties of BaTiO3 nanopowder 
  • Abdelaziz Salhia, Salaheddine Sayouria,*, Lahoucine Hajjib and TajEddine Lamcharfic
  • a LPTA, Department of Physics, Faculty of Sciences-DM, B.P. 1796, Fez-Atlas, Morocco b LMCN, F.S.T.G. University Cadi Ayyad Marrakech, Morocco c LSSCFST-Fès B.P. 2202-Route d'Imouzzer, Fès, Morocco
Abstract
Nanocrystalline barium titanate (BT) was synthesized by the sol gel method. The dry gel obtained was first treated in themicrowave (MW) and then calcined at different temperatures. A pure tetragonal phase was obtained under heat treatmentat 750 oC which is a relatively low temperature. SEM image reveals a fairly dense and uniform microstructure. Dielectricmeasurements performed on the sintered BaTiO3 sample at 1200 oC revealed the presence of the resonance phenomenon atfrequencies lower than 2 MHz and the existence of a weak positive temperature coefficient of resistivity (PTCR) just abovethe Curie temperature. Electric impedance analysis shows the predominance of the grain boundary (gb) contribution andenables determination of activation energies of the gb and the bulk effect and their relative capacitance and resistanceelements.

Keywords: Nanocrystalline BaTiO3, Sol gel process, Microwave, PTCR, Resonance

This Article

  • 2016; 17(12): 1236-1242

    Published on Dec 31, 2016