Composition, Temperature and Frequency Dependent Magnetic, Dielectric and Electrical Properties of Magnesium-Zinc Ferrites

Ceramics-ceramic composites in the series (1-x)Li2MoO4-xBaFe12O19 (LMO-BF12, 0.00≤x≤0.15) have been cold sintered at 120 o C and their structure and properties characterized. X-ray diffraction, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) confirmed that compositions were dual phase and had a dense microstructure. Composites in the xBF12-(1-x)LMO (0.0≤x≤0.15) series resonated at MW frequencies (~6GHz) with 5.6≤r≤5.8 and Qf =16,000-22,000 GHz, despite the black colour of compositions with x > 0. The permeability of the composites was measured in the X band (~8 GHz) and showed an increase from 0.94 (x=0.05) to 1.02 (x=0.15). Finite element modelling revealed that the volume fraction of BF12 dictates the conductivity of the material, with a percolation threshold at 10 vol.% BF12 but changes in r as a function of x were readily explained using a series mixing model. In summary, these composites are considered suitable for the fabrication of dual mode or enhanced bandwidth microstrip patch antennas.

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“…Cold where interaction causes a catastrophic deterioration in properties [33,34]. Guo et al [13] compared cold with conventionally sintered LMO.…”

Section: Discussionmentioning

confidence: 99%

High quality factor cold sintered Li2MoO4BaFe12O19 composites for microwave applications

et al. 2019

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“…It is observed that the X-ray density (q x ) of each sample is greater than the corresponding bulk density (q b ). This may be due to some unavoidable pores created during sintering process [17].…”

Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 99%

An investigation of structural and magnetic properties of Cr–Zn ferrite nanoparticles prepared by a sol–gel process

Lakshmi¹,

Kumar

Thyagarajan

2015

J Nanostruct Chem

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Cr x Zn Fe 2-x O 4 (with x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) spinel ferrite nanoparticles have been synthesized via sol-gel method. The precursor compound was calcined at a temperature of 900°C for 3 h. The aim of this study was to investigate the effect of Cr 3? ion substitution on the structural and magnetic properties of Cr-Zn ferrite. The size, shape, and chemical state of the synthesized powders were structurally characterized by powder XRD, SEM, TEM, HRTEM, SAED, energy-dispersive X-ray analysis (EDAX), and Fourier transform infrared spectroscopy (FTIR) spectral techniques. The XRD pattern of Cr-Zn ferrite provides information about single-phase formation of spinel structure with cubic symmetry. Both crystallite size and lattice parameter decrease with increasing Cr content. Formation of spinel structure is affirmed by using FTIR and FTIR spectra which shows that the bands t1 and t2 are found to shift gradually toward the higher frequency side with substitution of Cr, which have been attributed to the decrease in the lattice constant. SEM and TEM micrographs demonstrated that nanoparticles with narrow size distribution were obtained. The average grain size was found to be in nanometer range and of the order of 43-63 nm obtained using TEM images. Compositional stoichiometry was confirmed by EDAX technique. The magnetic properties of synthesized chromium-substituted Zn ferrite nanoparticles were studied using vibrating sample magnetometer at room temperature under the applied magnetic field of 15 KG. The result indicated that the amount of Cr contents significantly influenced the crystal morphology and structural and magnetic properties of Cr-doped Zn ferrite nanoparticles.

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Comparative study of frequency-dependent dielectric properties of ferrites MFe2O4 (M = Co, Mg, Cr and Mn) nanoparticles

et al. 2020

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Composition, Temperature and Frequency Dependent Magnetic, Dielectric and Electrical Properties of Magnesium-Zinc Ferrites

Cited by 9 publications

References 32 publications

High quality factor cold sintered Li2MoO4BaFe12O19 composites for microwave applications

High quality factor cold sintered Li2MoO4BaFe12O19 composites for microwave applications

An investigation of structural and magnetic properties of Cr–Zn ferrite nanoparticles prepared by a sol–gel process

Comparative study of frequency-dependent dielectric properties of ferrites MFe2O4 (M = Co, Mg, Cr and Mn) nanoparticles

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