Bhasin, Tanvi and Agarwal, Ashish and Sanghi, Sujata and Kotnala, R. K. and Shah, Jyoti and Yadav, Manisha and Tuteja, Muskaan and Singh, Jogender (2018) Crystal structure, dielectric, magnetic and improved magnetoelectric properties of xNiFe(2)O(4)-(1-x)Na0.5Bi0.5TiO3 composites. Materials Research Express, 5 (10). 106102-1-106102-15. ISSN 2053-1591

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Magnetoelectric (ME) composites of NiFe2O4-(1-x)Na0.5Bi0.5TiO3 (NBT) with composition xNiFe(2)O(4)-(1-x)Na0.5Bi0.5TiO3 (x = 0.20, 0.40, 0.60) were prepared successfully by solid state reaction method. The crystal structure analysis was carried by using x-ray diffractometer, field emission scanning electron microscope-energy dispersive analysis of x-rays (FESEM-EDX) and Fourier transform infrared spectroscopy (FTIR). The presence of two individual phases corresponding to ferrite and ferroelectric was confirmed by XRD analysis of composites. Rietveld refinement of XRD data further confirms the existence of both cubic (Fd3m) and rhombohedral (R3c) symmetries. FESEM micrographs and EDX spectra revealed the reduction in grain sizes with increase in ferrite content. FTIR spectra depict two prominent absorption bands around 413 cm(-1) and 618 cm(-1). Dielectric response of these samples was recorded at frequency range 100 Hz-7 MHz for different temperature. Dielectric constant (epsilon') and dielectric loss (tan delta) values found higher at low frequencies, decrease with increase in frequencies and become independent at higher frequencies. epsilon' and tan delta both enhance with rising temperature and become more stable at higher frequencies. Complex impedance spectroscopy (CIS) investigation was used to understand dielectric relaxation and conduction mechanism in composites. Cole-Cole plots for all samples depict two semicircles and the centre of semicircles is depressed below real axis with temperature. Activation energy rises with increase in ferrite content in composites. Magnetic evaluation of the samples discloses the soft magnetic nature of these composites. The maximum value of saturation magnetization (M-s = 22.82 emu g(-1)) and magnetic moment per formula unit (eta = 0.92 mu(B)) is observed for composition having higher NFO content. The highest ME response, alpha similar to 1122 mu V/cmOe is observed for the composite 0.60NiFe(2)O(4)-0.40Na(0.5)Bi(0.5)TiO(3).

Item Type: Article
Additional Information: Copyright for this article belongs to M/s IOP Publishing.
Subjects: Materials Science
Depositing User: Users 27 not found.
Date Deposited: 16 Dec 2019 11:45
Last Modified: 16 Dec 2019 11:45

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