Structural, dielectric and impedance study of a new lead free ferroelectric (Ba, M) (Ti, M) O3, M=Ca; Sr and M= Sn; Zr ceramics

International Conference and Exhibition on Materials Chemistry

March 31-April 01, 2016 Valencia, Spain

HOUDA MSOUNI, A Tachafine, D Fasquelle, M El Aatmani, J-C Carru, M El Hammioui and A Zegzouti

Cadi Ayyad University, Morocco
University of the Littoral Opal Coast, France

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

The dielectric properties and microstructure of co-doped B-site and A-site BaTiO3 solid solution of the type (Ba, M) (Ti, Mâ��) O3 were investigated. The influence of extremely small amount of Sr, Sn, Zr and Ca dopants on the microstructure and the dielectric characteristics of BaTiO3 were studied systematically. These compositions were designed using the conventional mixed oxide technique and the XRD analysis results indicated that no secondary phase was formed. The microstructure of sintered pellets was studied by SEM at room temperature. The dielectric measurements showed that the BSTZ ceramic present the highest permittivity at 25�°C and 100kHz with the value of 2600, whereas the crystallite size was found to approach 32.3 nm. The BaTiO3 ceramic with Sr at A-site has no phase transition above room temperature, while ceramics with Sn at B-site present ferroelectric â�� para-electric transition with sharp transition. Finally, the ceramic with Zr at B-site exhibit normal ferroelectric-para-electric transition with Tc=97�°C. The effect of doping was been studied and analyzed using the AC complex impedance spectroscopy technique to obtain the electrical parameters of polycrystalline samples in a wide frequency range at different temperatures. The piezoelectric properties were also studied.

Biography :

Email: houda.msouni@gmail.com