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Structure, infra-red, dielectric properties and conduction mechanism of Ti and Cu–Ti co-doped bismuth ferrite (BiFeO3): a comparison study

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Abstract

Multiferroic compositions BiFe0.90Ti0.10O3 and BiFe0.885Cu0.015Ti0.1O3 were synthesized by solid-state mixed oxide method. XRD studies confirmed rhombohedral crystal structure for both compositions while a little change in lattice parameters was observed with Cu–Ti co-doping. SEM analysis indicate that with co-doping comparatively smaller grains were evolved in the microstructure. Fourier-transform infrared spectroscopy (FTIR) was conducted to study absorption bands of different phases. High temperature A.C. conductivity (σac) analysis revealed the hopping charge conduction mechanism. Impedance spectroscopy (IS) was employed from room temperature to 230 °C in 100 Hz–1 MHz frequency range to analyze dielectric properties. IS data indicated decline in impedance with increase in temperature and frequency which confirms negative temperature coefficient of resistance (NTCR) behavior. Owing to the resistance–temperature characteristics, these compositions are well suited for thermal sensor applications.

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Acknowledgements

Authors would like to acknowledge Department of Physics and Department of Polymer and Process Engineering, UET Lahore for extending the infrastructural facilities.

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  1. Qaisar Khushi Muhammad

    Present address: Pakistan Institute of Technology for Minerals and Advanced Engineering Materials (PITMAEM), Pakistan Council of Scientific and Industrial Research (PCSIR) Laboratories Complex, Lahore, 54600, Pakistan

Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, University of Engineering and Technology (UET), Lahore, 54890, Pakistan

    Muhammad Asif Rafiq, Qaisar Khushi Muhammad, Sameel Nasir, Usama Amin & Adnan Maqbool

  2. Ibn-e-Sina Institute of Technology, Islamabad, Pakistan

    Zubair Ahmad

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Rafiq, M.A., Muhammad, Q.K., Nasir, S. et al. Structure, infra-red, dielectric properties and conduction mechanism of Ti and Cu–Ti co-doped bismuth ferrite (BiFeO3): a comparison study. Appl. Phys. A 124, 748 (2018). https://doi.org/10.1007/s00339-018-2170-8

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