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A. Elbasset ¹, T. Lamcharfi ², F. Abdi ², L. Mrharrab ², S. Sayouri ²

Affiliations
1 LSSC Department of Electrical Engineering, FST, Road Immouzer, Fes, MA
2 LPTA, Physics Department, Faculty of Science DM, B.P.1796, Fes-Atlas, MA

Abstract

Sol gel processed Pb1-xMxTiO3 (PMTx; M = Co, 0≤ x≤ 0.3; Cu, 0≤ x ≤0.2) powders, calcined at 700°C, were characterized by X-Ray Diffraction (XRD) and Raman spectroscopy. XRD analysis revealed well resolved spectra, and we have followed the influence of addition of Co and Cu with Raman spectroscopy. Indeed, the results showed that solubility limit is reached at the concentration of 10% for the samples PCuTx, and that the structure of the samples is not significantly altered by incorporation of Cu, while addition of Co transforms it from tetragonal to pseudocubic. Moreover, Raman analysis shows that Co occupied both A (Pb) and B (Ti) sites of the ABO3 (PbTiO3) perovskite structure of these materials for x > 10 %, while Cu occupies the same site A (Pb) in the whole range of concentration. To our knowledge, effects of doping with Co and Cu elements and the study of sites occupation in such materials have not been reported.

Keywords

Co and Cu Doping, Half-value Width, Incorporation, PT, Raman Shift

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A. Elbasset ¹, F. Abdi ¹, T. Lamcharfi ¹, S. Sayouri ², M. Abarkan ³, N. S. Echatoui ¹, M. Aillerie ⁴

Affiliations
1 LSSC Department of Electrical Engineering, FST, Road Immouzer, Fes - 220, MA
2 LPTA, Physics Department, Faculty of Science DM, B.P.1796, Fes-Atlas, MA
3 Laboratory Science of Physical Matter, Faculty Polydisciplinary, Road Oujda - B.P.1223, Taza, MA
4 Laboratory Mariaux Optiques, and Photonique University Paul Verlaine-Metz systems, UMR CNRS7132 (UMR National Center), MA

Abstract

Barium zirconium titanate ceramics, BaTi1–xZrxO3 (x = 0–15 at % with a step of 2.5%) (BTZx), were obtained by a sol-gel method. Perovskite-like single-phase compounds were confirmed from X-ray diffraction data. Morphological analysis on sintered samples by scanning electron microscopy shows that the addition of zirconium ions affects the growth of the grain and remarkably changes the grain morphology. The effect of zirconium addition to BT on dielectric properties is analyzed. Increasing Zr content in the BaTiO3-based compositions caused a decrease in the Curie temperature (Tc) and the permittivity increases. The Curie-Weiss law is well followed for the pure sample, but it is less respected in the case of BTZ10 and the variation of the Curie Weiss constant as a function of frequency is similar to the variation of the dielectric constant. On the other hand, the application of the modified Uchino law, to the BTZx materials, shows that the diffusio

Keywords

Barium Zirconate Titanate, Dielectric Properties, Grain Size, The Modified Uchino Law

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