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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/14710
Title: Enhanced dielectric and optical properties of nanoscale barium hexaferrites for optoelectronics and high frequency application
Authors: Mohammed J.
Suleiman A.B.
Tchouank Tekou Carol T.
Hafeez H.Y.
Sharma J.
Maji, Pradip K.
Kumar S.G.
Srivastava A.K.
Published in: Chinese Physics B
Abstract: M-type barium hexaferrites with chemical composition Ba1xDyxFe12yCryO19 (x = 0.0,0.1,0.2, and y =0.0,0.4,0.5) were synthesized via sol-gel auto-combustion method. The samples were pre-sintered at 400 C for 3 h and sintered at 950 -C for 5 h. The changes in the structural, dielectric, and optical properties were studied after the substitution of Dy3+ and Cr3+ ions. X-ray diffraction (XRD) analysis confirms the formation of single phase hexaferrites with the absence of secondary phase. FTIR analysis gives an idea of the formation of hexaferrites with the appearance of two peaks at 438 cm1 and 589 cm1. The field emission scanning electron micrographs (FESEM) show a combination of crystallites with large shapes close to hexagonal platelet-like shape and others with rice or rod-like shapes, whereas EDX and elemental analysis confirm the stoichiometry of prepared samples. The calculated band gap from UV-vis NIR spectroscopy spectra was found to decreases with increase in Dy3+-Cr3+ substitution. The dielectric properties were explained on the basis of Maxwell-Wagner model. Enhancement of dielectric constant at higher frequencies was observed in all the samples. Low dielectric loss is also observed in all the samples and Cole-Cole plot shows that grain boundary resistance (Rgb) contribute most to the dielectric properties. The prepared samples exhibit properties that could be useful for optoelectronics and high frequency application. © 2018 Chinese Physical Society and IOP Publishing Ltd.
Citation: Chinese Physics B (2018), 27(12): -
URI: https://doi.org/10.1088/1674-1056/27/12/128104
http://repository.iitr.ac.in/handle/123456789/14710
Issue Date: 2018
Publisher: Institute of Physics Publishing
Keywords: Cole-Cole plot
dielectric constant
Maxwell-Wagner model
optical band-gap
ISSN: 16741056
Author Scopus IDs: 57195149385
57203221517
57195152151
57189465536
57211363752
56249287900
57216769177
55455998000
Author Affiliations: Mohammed, J., Department of Physics, School of Chemical Engineering and Physical Sciences, Lovely Professional University, Phagwara, Punjab, 144411, India, Department of Physics, Faculty of Science, Federal University Dutse, P M B 7156, Jigawa state, Dutse, Nigeria
Suleiman, A.B., Department of Physics, Faculty of Science, Federal University Dutse, P M B 7156, Jigawa state, Dutse, Nigeria
Tchouank Tekou Carol, T., Department of Physics, School of Chemical Engineering and Physical Sciences, Lovely Professional University, Phagwara, Punjab, 144411, India
Hafeez, H.Y., Department of Physics, Faculty of Science, Federal University Dutse, P M B 7156, Jigawa state, Dutse, Nigeria, SRM Research Institute, SRM University, Kattankulathur Chennai, 603203, India
Sharma, J., Department of Physics, School of Chemical Engineering and Physical Sciences, Lovely Professional University, Phagwara, Punjab, 144411, India
Maji, P.K., Department of Polymer and Processing Engineering, Indian Institute of Technology Roorkee, Saharanpur Campus, Saharanpur, 247001, U P, India
Kumar, S.G., Department of Chemistry, Guru Nanak Dev University, Amritsa, 143005, India
Srivastava, A.K., Department of Physics, School of Chemical Engineering and Physical Sciences, Lovely Professional University, Phagwara, Punjab, 144411, India
Corresponding Author: Srivastava, A.K.; Department of Physics, School of Chemical Engineering and Physical Sciences, Lovely Professional UniversityIndia; email: Srivastava_phy@yahoo.co.in
Appears in Collections:Journal Publications [PE]

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