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Bindra Narang S.,Guru Nanak Dev University | Kaur P.,Guru Nanak Dev University | Bahel S.,Guru Nanak Dev University | Singh C.,Rayat Bahra Institute of Engineering and Nanotechnology
Journal of Magnetism and Magnetic Materials | Year: 2016

The present study reports microwave characterization of Co-Ti substituted ferrites with general formula, BaFe(12-2x)CoxTixO19 where x=0.0, 0.3, 0.5, 0.7 and 0.9. The structure, morphology, magnetic properties and microwave absorption of the synthesized compositions were investigated with X-ray diffraction, scanning electron microscope, vibrating composition magnetometer and vector network analyzer respectively. The complex permittivity (ε′-jε) and complex permeability (μ′-jμ) were measured using vector network analyzer from 8.2 to 12.4 GHz. It has been observed that the control of grain size, a decrease in coercivity and enhanced values of dielectric loss are effective means to improve the microwave absorption. The maximum absorption of 99% was obtained for the composition x=0.7 with a peak value of reflection loss of -25.15 dB at a thickness of 3.3 mm. © 2015 Elsevier B.V. All rights reserved. Source


Singh C.,Guru Nanak Dev University | Singh C.,Rayat Bahra Institute of Engineering and Nanotechnology | Jaroszewski M.,Wroclaw University of Technology | Narang S.B.,Guru Nanak Dev University | Ravinder D.,Osmania University
European Physical Journal B | Year: 2016

Thermoelectric and electrical characteristics investigation of M-type hexagonal ferrite,Ba0.5Sr0.5CoxRuxFe(12−2x)O19 (x = 0.0, 0.2, 0.4, 0.6,0.8, 1.0, 1.2), have been carried out from 303 K to 473 K. The static currentdensity-electric field characteristics have been measured at room temperature. The Seebeckcoefficient indicates n-type behavior at lower substitution and p-type conduction athigher substitution. The different electrical parameters are affected by change in grainsize with substitution of Co2+ and Ru4+ ions. The existence of polarons is confirmed fromincrease in conductivity with frequency. The static conduction due to applied electricfield is discussed qualitatively in terms of space charge limited current, ionic hopping,Poole-Frenkel and Schottky-Richardson mechanisms. The large current density has beenobserved at higher substitution. © 2016, EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg. Source


Kaur R.,Ramgharia Institute of Engineering and Technology | Kaur R.,Rayat Bahra Institute of Engineering and Nanotechnology | Dhillon N.,Ramgharia Institute of Engineering and Technology | Singh C.,Guru Nanak Dev University | And 3 more authors.
Solid State Communications | Year: 2015

The microwave absorption of Ba0.5Sr0.5CoxRuxFe(12-2x)O19 (x=0.0,0.2,0.4,0.8,1.0) ferrite has been investigated as a function of frequency, substitution and thickness. The static I-V characteristics have been studied as a function of substitution. The results exhibit reflection loss of -12.02 dB at 9.0 GHz in x=0.2. The electrical current density increases at higher substitution. The microwave and electrical properties show dependence on microstructure. The ferrite compositions for different electromagnetic applications are also suggested. © 2014 Elsevier Ltd. Source


Kaur R.,Rayat Bahra Institute of Engineering and Nanotechnology | Singh C.,Rayat Bahra Institute of Engineering and Nanotechnology | Singh C.,Guru Nanak Dev University | Kaur H.,Rayat Bahra Institute of Engineering and Nanotechnology | And 2 more authors.
European Physical Journal B | Year: 2015

Microwave characterization of SrCoxTixFe(12−2x)O19 (x = 0.0, 0.2, 0.3, 0.5, 0.6, 0.7, 1.0) ferrites has been studied as a function of frequency, substitution and thickness, and static electrical current density-electric field characteristics have been investigated as a function of substitution. Microwave characteristics have been measured using power meter in the rectangular slotted waveguide and current density is measured using electrometer. The microwave absorption is evaluated using the standard available model. The results depict −11.57 dB reflection loss at 10.38 GHz in composition x = 0.6. The electrical current density decreases at lower substitution and increases at higher substitution. The substitution of Co2+ and Ti4+ ions causes enhancement of electromagnetic and static electrical properties. © 2015, EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg. Source


Kaur R.,Rayat Bahra Institute of Engineering and Nanotechnology | Singh C.,Rayat Bahra Institute of Engineering and Nanotechnology | Singh C.,Guru Nanak Dev University | Bhikhan V.,Rayat Bahra Institute of Engineering and Nanotechnology | And 2 more authors.
European Physical Journal B | Year: 2015

The static current density (J)-electric field (E) characteristics of CaCoxTixFe(12−2x)O19 ferrite (x = 0.1,0.2,0.3,0.4,0.5,0.6,0.7) have been investigated from 0.06 kV/m to 4.10 kV/m at room temperature. Ohmic behavior is present in compositions x = 0.1,0.2,0.4,0.5,0.6,0.7 at low applied field, whereas non linearity in J-E curves is defined at higher applied region in compositions x = 0.2,0.3,0.4,0.7. The role of various conduction mechanisms Schottky, Poole-Frenkel, Ionic Hopping and Space Charge Limited Current mechanisms has been discussed. © 2015, EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg. Source

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