Synthesis and electrical behavior of Ni-Ti substituted Y-type hexaferrites for high frequency application

Ahmad, Bashir; Ashiq, Muhammad Naeem; Mumtaz, Saleem; Ali, Irshad; Najam-Ul-Haq, Muhmmad; Sadiq, Imran

doi:10.1016/j.jmmm.2017.12.026

Cited by 22 publications

(3 citation statements)

References 25 publications

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“…In this work, we measured the DC electrical resistivity (ρ) of W-type strontium ferrites Sr 0.8 Pr 0.2 (Zn 1.0−x Co x ) 2 Fe 16 O 27 (0.00 ≤ x ≤ 0.75) with the double-probe method at room temperature [42][43][44][45]. The change in resistivity can be affected by different parameters, such as grain size, chemical composition, and sintering temperature.…”

Section: Electrical Studymentioning

confidence: 99%

Investigation into the Structural, Spectral, Magnetic, and Electrical Properties of Cobalt-Substituted Strontium W-Type Hexaferrites

Yang

Chen

et al. 2022

Magnetochemistry

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The solid-state reaction method is used to synthesize W-type Sr hexagonal ferrites Sr0.8Pr0.2(Zn1.0−xCox)2Fe16O27 (x = 0.00, 0.15, 0.30, 0.45, 0.60, 0.75). The results of XRD for the W-type hexagonal ferrites, when Co content (x) is 0.00 ≤ x ≤ 0.75, exhibit that they are in the single W-type hexaferrite phase. As shown by morphological analysis, the particles are hexagonal-shaped platelets. The saturation magnetization (Ms) and magneton number (nB) increases with Co content (x) from 0.00 to 0.60. Ms and nB begins to decrease at Co content (x) ≥ 0.60. With increasing Co content (x) from 0.00 to 0.75, the magnetic anisotropy field (Ha), first anisotropy constant (K1), and coercivity (Hc) decrease gradually. The values of DC electrical resistivity for W-type hexagonal ferrites Sr0.8Pr0.2(Zn1.0−xCox)2Fe16O27 (0.00 ≤ x ≤ 0.75) are in the range of 20.854 × 107 Ω-cm and 22.755 × 107 Ω-cm.

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Section: Electrical Studymentioning

confidence: 99%

Investigation into the Structural, Spectral, Magnetic, and Electrical Properties of Cobalt-Substituted Strontium W-Type Hexaferrites

Yang

Chen

et al. 2022

Magnetochemistry

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“…Among the six different interstitial sites, three (18h VI , 3b VI , 3a VI ) have spin in the upward direction while the other three (6c VI , 6c IV * , 6c IV ) have spin in the downward direction [20]. In the literature, various reports on Y-type hexaferrites for microwave absorbers have focused on the enhancement of microwave absorption through substitution of various metal cations such as Zn 2+ , Co 2+ , Cu 2+ and Ni 2+ in the Me site in the chemical formula of Ba 2 Me 2 Fe 12 O 22 [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Effective lightweight, flexible and ultrathin PVDF/rGO/Ba₂Co₂Fe₁₂O₂₂ composite films for electromagnetic interference shielding applications

Ананд

Pauline

2021

Nanotechnology

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In this study, we developed a simple and cost-effective solvent film casting method to fabricate ultrathin, flexible and lightweight polyvinylidenefluoride (PVDF)-based composites that provide high electromagnetic interference (EMI) shielding performance. Y-type barium hexaferrite with general formula Ba 2 Co 2 Fe 12 O 22 was first synthesized by the sol-gel autocombustion method and then reduced graphene oxide (rGO) was prepared by modified Hummer's method. The crystal structure, morphology, elemental surface analysis and magnetic properties of the samples were systematically investigated using x-ray diffraction spectroscopy, Fourier-transform infrared spectroscopy, Raman spectroscopy, high-resolution scanning electron microscopy, energydispersive x-ray spectroscopy, x-ray photoelectron spectroscopy and vibrating sample magnetometry. Then, the complex permittivity, complex permeability and EMI shielding properties of the flexible PVDF/rGO/Ba 2 Co 2 Fe 12 O 22 composite films with two different amounts of Ba 2 Co 2 Fe 12 O 22 NP content and a fixed amount of rGO content were investigated using a vector network analyzer. The structural characterizations of the resultant composite films showed the formation of an electroactive β-phase of PVDF with addition of Ba 2 Co 2 Fe 12 O 22 nanoparticles and rGO content. The enhancement of the β-phase in the PVDF/rGO/Ba 2 Co 2 Fe 12 O 22 nanocomposites was explained from a physicochemical viewpoint. Furthermore, the electrically conductive and magnetic properties of PVDF composite films incorporating rGO and Ba 2 Co 2 Fe 12 O 22 NPs exhibited a high EMI shielding effectiveness of 25.63 dB, with an absorptiondominated shielding feature in the 8-12 GHz region. The enhanced absorption was attributed to the electrostatic interaction induced by the β-phase fraction in the PVDF matrix, and subsequently from multiple reflections and magnetic loss originating from the synergetic effect of rGO and Ba 2 Co 2 Fe 12 O 22 NPs. This study introduces a low-cost and scalable method for the design of novel, lightweight, flexible and efficient EMI shielding composite films with promising prospects for application in the construction, electronics and aerospace fields.

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“…T-block is made up of four layers, with Me, a divalent cation replacing an oxygen atom in the middle of two layers. There are a total of eight sites in T-block, two tetrahedral, and six octahedral sites [8]. There are several procedures for preparing ferrites, including the sol-gel method, co-precipitation method, citrate gel, sol-gel auto combustion, and micro emulsion methodology.…”

mentioning

confidence: 99%

Structural, Morphology, Electrical Polarization and FTIR Properties of Zn Substituted T-type Hexagonal Ferrites

Abbas¹,

Sadiq²,

Sadiq³

et al. 2022

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A series of divalent Zn substituted T-type hexagonal ferrite material having the composition (x= 0.0, 0.02, 0.06, 0.1) was synthesized by using the sol-gel auto combustion method. Structural, morphological, optical, and electrical properties of T-type hexagonal ferrite were explored by using an X-ray diffractometer, scanning electron microscopy, Fourier transform infrared spectroscopy and Precision multiferroic II. The X-ray diffraction (XRD) patterns showed the single hexagonal phase ferrites for all the samples. With the substitution of the ions, the change in the values of lattice constants ‘a’, ‘c’ and unit cell volume was observed. The Debye Scherrer formula was used to calculate the crystallite size which was determined to be varied in the range of 26.3nm to 28.3nm. FTIR spectra also indicated that the present synthesized material had single-phase hexagonal structure. SEM micrographs revealed the agglomeration of small grains. The average grain size was found to be 0.331um which might be suitable for microwave absorption applications. The Polarization verse Electric field (P-E) loops unveiled the increase in saturation and remnant polarization. The P-E loops also exhibited the lossy behavior after substitution and the increase in lossy behavior with substitution results in an increase in conductivity of the material.

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Synthesis and electrical behavior of Ni-Ti substituted Y-type hexaferrites for high frequency application

Cited by 22 publications

References 25 publications

Investigation into the Structural, Spectral, Magnetic, and Electrical Properties of Cobalt-Substituted Strontium W-Type Hexaferrites

Investigation into the Structural, Spectral, Magnetic, and Electrical Properties of Cobalt-Substituted Strontium W-Type Hexaferrites

Effective lightweight, flexible and ultrathin PVDF/rGO/Ba₂Co₂Fe₁₂O₂₂ composite films for electromagnetic interference shielding applications

Structural, Morphology, Electrical Polarization and FTIR Properties of Zn Substituted T-type Hexagonal Ferrites

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Synthesis and electrical behavior of Ni-Ti substituted Y-type hexaferrites for high frequency application

Cited by 22 publications

References 25 publications

Investigation into the Structural, Spectral, Magnetic, and Electrical Properties of Cobalt-Substituted Strontium W-Type Hexaferrites

Investigation into the Structural, Spectral, Magnetic, and Electrical Properties of Cobalt-Substituted Strontium W-Type Hexaferrites

Effective lightweight, flexible and ultrathin PVDF/rGO/Ba2Co2Fe12O22 composite films for electromagnetic interference shielding applications

Structural, Morphology, Electrical Polarization and FTIR Properties of Zn Substituted T-type Hexagonal Ferrites

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Effective lightweight, flexible and ultrathin PVDF/rGO/Ba₂Co₂Fe₁₂O₂₂ composite films for electromagnetic interference shielding applications