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Impedance spectroscopy studies on (Na0.5Bi0.5)0.94Ba0.06TiO3 + 0.3 wt% Sm2O3 + 0.25 wt% LiF lead-free piezoelectric ceramics

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Abstract

The a.c. complex impedance spectroscopy technique was used to obtain the electrical parameters of (Na0.5Bi0.5)0.94Ba0.06TiO3 +0.3 wt% Sm2O3 +0.25 wt% LiF lead-free ceramics in a wide frequency range at different temperatures. These samples were prepared by a high-temperature solid-state reaction technique and their single phase formation was confirmed by the X-ray diffraction technique. Dielectric studies exhibit a diffuse phase transition characterized by a temperature and frequency dispersion of permittivity, and this relaxation has been modelled using the modified Curie–Weiss law. The variation of imaginary part (Z′′) of impedance with frequency at various temperatures shows that the Z′′ values reach a maxima peak (Z \(^{\boldsymbol {\prime \prime }}_{\boldsymbol {\max }}\)) above 400∘C. The appearance of single semicircle in the Nyquist plots (Z′′ vs. Z′) pattern at high temperatures suggests that the electrical process occurring in the material has a relaxation process possibly due to the contribution for bulk material only. The bulk resistance of the material decreases with rise in temperatures similar to that of a semiconductor, and the Nyquist plot showed the negative temperature coefficient of resistance (NTCR) character of these materials. The frequencies, thermal effect on a.c. conductivity and activation energy have been assessed.

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Authors and Affiliations

  1. Laboratoire de Chimie Appliquée et Génie Chimique de l’Université Mouloud Mammeri de Tizi-Ouzou, Tizi-Ouzou, Algeria

    N ZIDI & A CHAOUCHI

  2. Laboratoire des Matériaux Céramiques et Procédés Associés, Université de Valenciennes et du Hainaut-Cambrésis, Z.I. du Champ de l’Abbesse, 59600, Maubeuge, France

    S D’ASTORG, M RGUITI & C COURTOIS

  3. Université Lille Nord de France, F-59000, Lille, France

    S D’ASTORG, M RGUITI & C COURTOIS

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  1. N ZIDI
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  2. A CHAOUCHI
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  3. S D’ASTORG
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  4. M RGUITI
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  5. C COURTOIS
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ZIDI, N., CHAOUCHI, A., D’ASTORG, S. et al. Impedance spectroscopy studies on (Na0.5Bi0.5)0.94Ba0.06TiO3 + 0.3 wt% Sm2O3 + 0.25 wt% LiF lead-free piezoelectric ceramics. Bull Mater Sci 38, 731–737 (2015). https://doi.org/10.1007/s12034-015-0888-x

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  • DOI: https://doi.org/10.1007/s12034-015-0888-x

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