Rayat Bahra Institute of Engineering and Nanotechnology

Hoshiārpur, India

Rayat Bahra Institute of Engineering and Nanotechnology

Hoshiārpur, India

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

Polycrystalline M-type CaCoxTixFe(12−2x)O19 (x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6) hexagonal ferrite compositions, with substitution of Co2+ and Ti4+ ions, have been synthesized by a two-route ceramic method. Vector network analysis was used to measure various microwave and electromagnetic parameters from 8.2 GHz to 12.4 GHz. The microwave shielding effectiveness (SE) due to absorption (SEA) and reflection (SER) was investigated based on S-parameters for the near field, and intrinsic parameters, accompanied by AC conductivity and skin depth, for the far field. The shielding effectiveness was primarily governed by absorption (SEA), and substitution of Co2+ and Ti4+ ions resulted in near- and far-field SEA of 54.85 dB at 10.49 GHz and 63.43 dB at 1.15 (Ω m)−0.5, respectively, for the composition with x = 0.6. The AC conductivity exhibited a monotonic increase with frequency, whereas the skin depth decreased with frequency for all the compositions. The composition with x = 0.6 exhibited a 20-dB wide absorption bandwidth (WAB) of 3.67 GHz and 3.66 GHz for near and far field, respectively. The composition with x = 0.3 showed a 10-dB narrow absorption bandwidth (NAB) of 80 MHz for the far field. © 2016 The Minerals, Metals & Materials Society


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.


Singh C.,Rayat Bahra Institute of Engineering and Nanotechnology | Singh C.,Guru Nanak Dev University | Kaur R.,Rayat Bahra Institute of Engineering and Nanotechnology | Bindra Narang S.,Guru Nanak Dev University | And 3 more authors.
Journal of Electronic Materials | Year: 2016

The microwave characteristics of Pb0.45Ca0.55(Fe0.5Nb0.5)1−xSnxO3 multiferroics (x = 0.03, 0.06, 0.09, 0.12, 0.15) have been investigated as a function of frequency (8–12 GHz) and thickness for different substitutions of Sn4+ ions. The absorber testing device method is used to study microwave properties in the rectangular slotted waveguide. The condition of microwave signal after passing through different compositions has been reported. The quarter wavelength criterion is used to evaluate the microwave absorption. The large microwave absorption is observed at lower as well as higher substitution. Maximum reflected power has been found at higher substitution. The different compositions for electromagnetic applications have also been put forth. © 2016, The Minerals, Metals & Materials Society.


Bhikhan V.,Rayat Bahra Institute of Engineering and Nanotechnology | Singh C.,Rayat Bahra Institute of Engineering and Nanotechnology | Singh C.,Guru Nanak Dev University | Kaur R.,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 BaCoxTixFe(12−2x)O19 ferrite compositions (x = 0.1, 0.3, 0.5, 0.7, 0.9) have been investigated at an applied field from 0.003 kV/m to 4.98 kV/m at room temperature. Compositions x = 0.3, 0.5 and 0.7 exhibit ohmic behavior at low applied field and non-linear conduction is observed in compositions x = 0.1, 0.3, 0.7 and 0.9 at higher applied field. The various non-linear conduction models, associated with Schottky, Poole-Frenkel, Ionic Hopping and Space Charge Limited Current mechanisms, have been discussed. The large current density has been found at higher substitution. © 2015, EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.


Bhikhan V.,Rayat Bahra Institute of Engineering and Nanotechnology | Singh C.,Rayat Bahra Institute of Engineering and Nanotechnology | Singh C.,Guru Nanak Dev University | Kaur R.,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 SrCoxTixFe(12−2x)O19 ferrite compositions (x = 0.0, 0.2, 0.3, 0.5, 0.6, 0.7, 1.0) have been investigated from 0.07 kV/m to 5.29 kV/m at room temperature. All compositions obey Ohms Law at low applied field and non-linearity conduction is observed at high field in compositions x = 0.0, 0.2, 0.3, 0.5, 0.6 and 1.0. The non-linear conduction mechanisms, Schottky, Poole-Frenkel, Ionic Hopping and Space Charge Limited Current mechanism, have been discussed. The current density is increased at higher substitution. © 2015, EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.


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.


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.


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

The microwave characteristics of Co2+ and Ti4+ ions substituted, BaCoxTixFe(12−2x)O19 (x = 0.1, 0.3, 0.5, 0.7, 0.9) ferrite have been studied as a function of thickness, frequency and substitution. The results depict reflection loss of − 31.94 dB at 10.47 GHz in x = 0.9. The highest static electrical current is observed at lower substitution. The model accompanying microwave absorption is used to evaluate microwave absorption characteristics. The electromagnetic and static electrical characteristics are improved with the substitution of Co2+ and Ti4+ ions. The compositions for possible electromagnetic applications are also explored. © 2015, EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.


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.


Singh C.,Rayat Bahra Institute of Engineering and Nanotechnology | Singh C.,Guru Nanak Dev University | Kaur H.,Rayat Bahra Institute of Engineering and Nanotechnology | Bindra Narang S.,Guru Nanak Dev University | And 3 more authors.
Journal of Alloys and Compounds | Year: 2016

The microwave characterization of Mn2+ and Ti4+ ions substituted M-type SrMnxTixFe(12-2x)O19 hexagonal ferrite (x = 0.5, 1.0, 1.5 and 2.0) has been reported as a function of frequency, substitution and thickness in X-band. The static current density (J)-electric field (E) characteristics have been investigated as a function of substitution at an applied field from 4 kV/m to 40 kV/m. The microwave characteristics have been measured using microwave power meter in the rectangular slotted waveguide and the current density has been measured using electrometer. The microwave absorption has been evaluated using the standard model of quarter wavelength criterion. The microwave absorption is enhanced while electrical current density is decreased with the substitution of Mn2+ and Ti4+ ions. The different compositions have scope for microwave or high frequency absorber applications. © 2016 Published by Elsevier B.V.

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