Investigation of Crystal Structure, Electrical and Magnetic Properties of Spinel Mn-Cd Ferrite Nanoparticles

Abouhaswa, A.S.; Badr, Mohamed H.; Nasr, M. H.; Elkholy, M. M.; El-Deen, L.M. Sharaf; Turky, Gamal; Moustafa, Mohamed; El-Hamalawy, A. A.

doi:10.1007/s10904-021-02116-9

Cited by 17 publications

(11 citation statements)

References 52 publications

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“…The reported high values of corecivity in this work and its increase with Cd-content in samples with x > 0.0 could be referred to the presence of α-Fe 2 O 3 impurity phase in these samples. A similar behavior of the increase in coercivity with the increase in both Cd-content and α-Fe 2 O 3 has been reported [29]. According to Jahan et al [16], coercivity could be improved by unwanted magnetic construction, such as induced blocked particles, inside the nanoparticles' grains.…”

Section: Magnetic Analysissupporting

confidence: 71%

“…Another aim is to study the effect of self-produced hematite phase on the coercivity of Cd-Zn nanoparticles. Whereas, reported coericivity values and their increase with both Cd-content and α-Fe 2 O 3 have been reported in Mn-Cd ferrites by the authors [29]. Future work will focus on further investigation of the role played by hematite phase in spinel ferrites. ]…”

Section: Introductionmentioning

confidence: 78%

“…SEM micrographs showed agglomeration of nearlyspherical grains with roughly uniform size distribution, figure 4. The observed agglomeration is commonly observed in these ferrites [29,40] and has been attributed to the slow rate of growth of magnetic nanoparticles achieved by the employed preparation technique [13,41]. The substitution of Zn by Cd has a considerable impact on the average grain size and was found to increase from 79 nm for ZnFe 2 O 4 ferrite to 149 nm for CdFe 2 O 4 .…”

Section: Sem Analysismentioning

confidence: 86%

“…The hydroxy (O-H) group was identified by the broad stretching vibrations band at around 3460 cm −1 as a result of water adsorption [42,43]. Whereas, the band at around 1636 cm −1 was attributed to bending vibration of water molecules [44,45] and at 1377 cm −1 to trapped nitrates [29,46]. The absorption bands in the range 400-750 cm −1 reflect the characteristic lattice vibrations of the crystal lattice [47].…”

Section: Ftir Analysismentioning

confidence: 99%

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Structural and magnetic analysis of Cd-Zn spinel ferrite nanoparticles

Badr¹,

Kudrevatykh²,

Hassan³

et al. 2023

Phys. Scr.

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Sol-gel auto-combustion synthesis technique was employed to synthesize Cd-Zn ferrite nanoparticles with composition Zn1-xCdxFe2O4, where 0.0≤ x≤ 1.0. The physical properties of prepared samples were inspected by using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR) and vibration sample magnetometer (VSM) techniques. XRD analysis confirmed the formation of Cd-Zn spinel nano-ferrites with an increase in experimental lattice constant from 8.37 Å to 8.74 Å for zinc and cadmium ferrite samples, respectively. Variation of tetrahedral and octahedral hopping lengths, crystallite size, microstrain and dislocation density with Cd-content has been investigated and elucidated. SEM micrographs showed agglomeration of nearly-spherical grains that increased in size with Cd-content increase. FTIR analysis confirmed the existence of the characteristic tetrahedral and octahedral stretching vibrations of metal ion and oxygen complex in the range 429-558 cm-1. VSM measurements revealed a tuning in coercivity to higher values and a decrease in saturation magnetization as Cd-content increased. The calculated cations distribution, bond lengths, bond angles and interionic distances between cations at tetrahedral and octahedral sites attribute the observed decrease in saturation magnetization to weak interaction between cations in the two sites.

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Section: Magnetic Analysissupporting

confidence: 71%

Section: Introductionmentioning

confidence: 78%

Section: Sem Analysismentioning

confidence: 86%

Section: Ftir Analysismentioning

confidence: 99%

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Structural and magnetic analysis of Cd-Zn spinel ferrite nanoparticles

Badr¹,

Kudrevatykh²,

Hassan³

et al. 2023

Phys. Scr.

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“…The literature on Debye temperatures of spinel ferrites from the diffraction data is quite limited, and some of the published fits appear to be problematic. , The values obtained from diffraction are generally lower than those from IR or elastic constants, and this was postulated to be an artifact of using the Fd 3̅ m space group in structural refinements instead of the claimed true space group of F 4̅3 m . However, the average Debye temperatures found here are significantly higher than those previously determined from diffraction and in quite good agreement with those reported from IR, 569 K for ZnFe 2 O 4 , and elastic constants, which generally lie in the 450–700 K range for spinel ferrites. ,− This, in conjunction with our analysis establishing Fd 3̅ m as the true space and the poor agreement between the diffraction data and the model reported by Modi et al and Lakhani et al, points to the previous values reported from diffraction being inaccurate due to insufficient data quality or potentially varying defect structures.…”

Section: Resultssupporting

confidence: 50%

Benchmark Crystal Structure of Defect-Free Spinel ZnFe₂O₄

Sandemann,

Støckler,

Wang

et al. 2023

J. Am. Chem. Soc.

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Accurate structural models are of paramount importance for elucidating structure–property relationships in functional materials. Spinels (AB2O4) form a highly important family of materials with complex crystal structures, and subtle structural details have a critical bearing on understanding their physical properties. In some spinels, the space group symmetry is debated, and in general, point defects such as cation inversion and interstitials add complexity. Most studies of spinels concern powder materials, and this challenges deep structural characterization. In fact, most published spinel structures have dubious atomic displacement parameters (ADPs), which is a typical sign of problematic structural description in the refinement of diffraction data. Here, we use various X-ray and neutron diffraction techniques to establish a benchmark crystal structure for the essentially defect-free spinel ferrite ZnFe2O4, which is a widely studied frustrated magnet. It is shown that the appearance of Fd3̅m forbidden reflections in the ZnFe2O4 single-crystal neutron diffraction data is an artifact of multiple scattering rather than the loss of inversion symmetry. We then provide benchmark ADPs and demonstrate how strongly these parameters affect the refined cation inversion. The ADPs reported here may be used as reference data to test the soundness of refined structural models, possibly to constrain those based on suboptimal data quality, and thereby provide a more accurate fundamental understanding of the structure–property relationship in spinel-type materials.

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