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High permittivity and low dielectric loss analysis of lead free Sr1−x La x (Ti0.5Fe0.5)O3

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Abstract

The structural and electrical properties of lead free Sr1−x La x (Ti0.5Fe0.5)O3 (SLTFO) prepared by standard solid state reaction technique were studied. The X-ray diffraction analysis confirmed the formation of a single-phase cubic perovskite structure. The compositional dependence of lattice constant, density and microstructural studies show that they vary significantly with La3+ content. When measured at 10 kHz, all the compositions of SLTFO at room temperature exhibit a high permittivity (about 104) and low dielectric loss (about 10−3). SLTFO also display minimum dielectric loss within the lower and higher limits of frequency, indicating that the samples are of good quality. It is concluded from the calculated ac conductivity that the conduction is due to mixed polarons hopping. The complex impedance plot exhibits a tendency of forming a single semicircular arc for all compositions, which implies a dominance of grain boundary resistance on the impedance. Impedance parameters were determined by fitting the experimental data with Cole-Cole empirical formula. The results of the present experiment indicate that the lead free SLTFO materials with higher permittivity and lower dielectric loss have possible practical applications.

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Authors and Affiliations

  1. Department of Physics, Primeasia University, Banani, Dhaka, 1213, Bangladesh

    M. R. Shah

  2. Department of Physics, Bangladesh University of Engineering and Technology, Dhaka, 1000, Bangladesh

    A. K. M. Akther Hossain

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  1. M. R. Shah
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Correspondence to M. R. Shah.

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Foundation item: Project supported by CASR of Bangladesh University of Engineering and Technology (BUET)

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Shah, M.R., Akther Hossain, A.K.M. High permittivity and low dielectric loss analysis of lead free Sr1−x La x (Ti0.5Fe0.5)O3 . J. Cent. South Univ. 20, 3363–3371 (2013). https://doi.org/10.1007/s11771-013-1860-9

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  • DOI: https://doi.org/10.1007/s11771-013-1860-9

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