Structural, magnetic and dielectric properties of Co-Zr substituted M-type calcium hexagonal ferrite nanoparticles in the presence of α-Fe2O3 phase

Chauhan, Chetna C.; Kagdi, Amrin R.; Jotania, Rajshree B.; Upadhyay, Anupama; Singh, Charanjeet; Shirsath, Sagar E.; Meena, Sher Singh

doi:10.1016/j.ceramint.2018.06.249

Cited by 155 publications

(26 citation statements)

References 48 publications

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“…The ratio Mr/Ms is called squareness ratio (SQR), which determines the magnetic hardness of materials and the existence of group exchange between grains [45]. It is reported that when 0.05 < Mr / Ms < 0.5, the sample has a single domain magnetostatic coupling [46]. The squareness ratio of NZRF spinel ferrite is calculated, and the results have been shown in Table 3.…”

Section: Tem Analysismentioning

confidence: 99%

Structure and magnetic properties of coprecipitated nickel-zinc ferrite-doped rare earth elements of Sc, Dy, and Gd

Pan

Gao

et al. 2021

J Mater Sci: Mater Electron

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This research is the basic study of temperature-sensitive ferrite characteristics prepared by coprecipitation with doping different typical sizes of rare earth elements. Ni 0.5 Zn 0.5 Re x Fe 2-x O 4 (NZRF) (X = 0.02, 0.05, 0.07 and 0.09) nanoparticles (NPs) doped by Sc, Dy and Gd prepared by chemical coprecipitation method. The structure and properties of Ni 0.5 Zn 0.5 Re x Fe 2-x O 4 were analyzed by various characterization methods. XRD results show that the grain size of Ni 0.5 Zn 0.5 Re x Fe 2-x O 4 is from 10.6 to 12.4 nm, which is close to the average grain size of 13.9 nm observed on TEM images. It is also found that the ferrite particles are spherical and slightly agglomerated in TEM images. FTIR measurements between 400 and 4000 cm -1 have con rmed the intrinsic cation vibration of the spinel structure. The concentrations of nickel, zinc, iron, and rare earth elements have been determined by ICP-AES, and all ions have participated in the reaction. The magnetic properties of Sc, Dy, and Gd 3+ doped NZRF NPs at room temperature are recorded by a physical property measurement system (PPMS-9). It is found that the magnetization can be changed by adding rare-earth ions. When X = 0.07, Gd 3+ doped Ni 0.5 Zn 0.5 Fe 2 O 4 (NZF) exhibits the highest saturation magnetization. The magnetic properties of NZGd 0.07 vary the most with temperature. The thermomagnetic coe cient of NZGd 0.07 nanoparticles stabilized to 0.18 emu/gK at 0-100℃. Hence, NZGd 0.07 with low Curie temperature and the high thermomagnetic coe cient can be used to prepare temperature-sensitive ferro uid. All the samples exhibit very small coercivity and almost zero remanences, which indicates the superparamagnetism of the synthesized nanoparticles.

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Section: Tem Analysismentioning

confidence: 99%

Structure and magnetic properties of coprecipitated nickel-zinc ferrite-doped rare earth elements of Sc, Dy, and Gd

Pan

Gao

et al. 2021

J Mater Sci: Mater Electron

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“…The variation can be explained on the basis of higher atomic radii of Zn 2+ and Zr 4+ ions as compared to Fe 3+ [25,26,29]. The c/a ratios for the M-type hexaferrites has been reported to be lower than 3.98 [43]. In all our samples (x = 0.00 to 1.00), this ratio varies between 3.92 and 3.94, thereby indicating that all the samples are M type hexagonal ferrites.…”

Section: Structural Studiesmentioning

confidence: 60%

“…Figure 1b shows the X-ray diffractograms of SrZn 1c clearly reveals the shifting of two highest intensity peaks (107 and 114) toward lower 2θ with increase in "x". This shifting of peak position is indicative of lattice expansion which is due to higher atomic radii of Zn 2+ (0.74 Å) and Zr 4+ (0.80 Å) in comparison to Fe 3+ (0.64 Å) [43].…”

Section: Structural Studiesmentioning

confidence: 94%

“…dopants (beyond x = 0.20) contributes to a) reduction of superexchange interactions between tetrahedral and octahedral sites (4f1-2a and 4f1-12k) and b) loss of magnetic collinearity resulting in canted spin structure [25,26]. This results in a decrease in the values of , where μ 0 ¼ 1 (in CGS units) is magnetic permeability of free space and other symbols have their usual meaning [43]. The simultaneous plot of H c and K with "x" is shown in Figure 7.…”

Section: Raman Studiesmentioning

confidence: 99%

“…As can be seen in Table 4, the x = 0.20 sample has a maximum squareness ratio (0.56) as compared to other samples. For x > 0.40 samples, the squareness ratio is ˂0.5, which means that the grains in these samples are randomly oriented and are multi domain in nature [43].…”

Section: Raman Studiesmentioning

confidence: 99%

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Tailoring the magnetic properties of M-type strontium ferrite with synergistic effect of co-substitution and calcinations temperature

Godara

Kaur

Narang

et al. 2021

Journal of Asian Ceramic Societies

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SrFe 12 O 19 samples were initially prepared using sol-gel auto-combustion method and calcined from 500 to 1100°C (for 6 h). XRD data established the phase formation temperature of SrM phase to be ≈1000°C. Thereafter, the effect of Zn 2+ -Zr 4+ co-dopant on magnetic and structural properties of SrZn x Zr x Fe 12-2x O 19 (x = 0.00-1.00) samples calcined between 900-1100°C was investigated. XRD data shows that the cell volume increases (from 690.45Å 3 (x = 0.00) to 705.72Å 3 (x = 1.00)) while crystallite size decreases (from 123.9 nm (x = 0.00) to 62.3nm (x = 1.00)) calcined at 1000°C. The Rietveld refinement of XRD data confirms a) x = 0.00 sample to be phase pure and b) the presence of ZnFe 2 O 4 (≈2.25) & SrZrO 3 (≈2.93%) impurity phases in x = 1.00 sample, calcined at 1000°C. FESEM micrographs revealed that a) grain size decreases for x > 0.20 with `x' at 900°C and b) increases from 122 nm at 900°C to 443 nm at 1100°C, for x = 0.00. Broadening of Raman bands reveals generation of strain in the lattice with enhancement of Zn 2+ -Zr 4+ concentration. The magnetic studies reveal that the coercivity monotonically decreases (from 5358(x = 0.00) Oe to 690(x = 1.00) Oe at 1000°C) with enhancement of Zn 2+ -Zr 4+ concentration. A maximum M s value ≈ 70.89 emu/g was observed in x = 0.20 sample at 1100°C. M s value also decreases for x > 0.20 at each calcination temperature.

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Recent Progress in Hexagonal Ferrites Based Composites for Microwave Absorption

Mohammed

Mohammed²,

Srivastava

2022

Cryst. Res. Technol.

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With the fast growth of wireless communication technology in high‐frequency ranges, electromagnetic (EM) interference has become a growing concern that has drawn international attention. The development of materials that can absorb EM radiation is a crucial solution. This review provides a detailed overview of ferrites, specifically hexagonal ferrites and their composites for microwave (MW) absorption. It examines hexagonal ferrite classifications based on the stacking order of their fundamental blocks and their synthesis methods and strategies for improving their magnetic properties. On the other hand, this review included a detailed examination of hexagonal ferrites–conducting polymer, hexagonal ferrites–2D materials, and hexagonal ferrite–other nanomaterials composites for MW absorption applications. Enhancing MW absorption in hexagonal ferrites‐based microwave absorption materials (MAMs) regulates their EM characteristics, improves impedance matching, and creates a diversity of loss mechanisms. In addition, the limitations, challenges, and opportunities of hexagonal ferrites‐based MAMs are discussed, which will be helpful to those working in related areas. As a general application potential, it is worth mentioning that, as a result of recent promising findings in the synthesis of hexagonal ferrites‐based composites, hexaferrite‐based composites are suitable devices in the area of microwave absorption.

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Structural, magnetic and dielectric properties of Co-Zr substituted M-type calcium hexagonal ferrite nanoparticles in the presence of α-Fe2O3 phase

Cited by 155 publications

References 48 publications

Structure and magnetic properties of coprecipitated nickel-zinc ferrite-doped rare earth elements of Sc, Dy, and Gd

Structure and magnetic properties of coprecipitated nickel-zinc ferrite-doped rare earth elements of Sc, Dy, and Gd

Tailoring the magnetic properties of M-type strontium ferrite with synergistic effect of co-substitution and calcinations temperature

Recent Progress in Hexagonal Ferrites Based Composites for Microwave Absorption

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