Influence of Zn 2+ ions on the structural and electrical properties of Mg 1−x Zn x FeCrO 4 spinels

Khalaf, Kadhim A.M.; Al-Rawas, A. D.; Widatallah, H. M.; Al-Rashdi, K.S.; Sellai, A.; Gismelseed, A. M.; Hashim, Mohd.; Jameel, Sabah; Al-Ruqeishi, Majid S.; Al-Riyami, Khamis; Shongwe, Musa S.; Al-Rajhi, A.H.

doi:10.1016/j.jallcom.2015.10.157

Cited by 61 publications

(26 citation statements)

References 25 publications

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“…The calculated values of average crystallite size (t) were found to be 30.8 and 63.2 nm for the 800 and 1000°C annealed samples, respectively, these values are listed in Table 1. In comparison, these values are within range of the reported values of 28.7 nm for particles prepared by conventional solid phase reaction (Khalaf et al 2016), 30.2 nm by sol-gel method (He 2010) and 52.4 and 6.4 nm by sol-gel and co-precipitation with reverse microemulsion (Rida et al 2010). Figure 6band c is a presentation of the powder X-ray diffraction profiles for the annealed boiled ESM templated MgCr 2 O 4 nanocrystalline powders.…”

Section: Heat Treatmentssupporting

confidence: 80%

“…The development of a synthesis route capable of producing MgCr 2 O 4 nanomaterials with controlled size and morphology is important due to their potential applications as smart and functional materials. Various methods, such as solid state reaction (Finocchio et al 1995), sol-gel method (SG) (Andrade et al 2006), co-precipitation (Zhang et al 1987), solution combustion (Arai et al 1986), co-precipitation within reverse micro-emulsion (Rida et al 2010), combustion method (Hosterman et al 2013) and conventional double sintering ceramic technique (Khalaf et al 2016) have been applied in the preparation of pirochromite based nanoparticles. Nevertheless, some of these methods are generally complicated, non-reliable, timeconsuming, and expensive for large scale production.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of nanostructured pirochromite magnesium chromate with egg shell membrane template

Ramachandran

Hamed

2016

Appl Nanosci

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In this work, we report on the use of fresh and boiled egg shell membrane as bio-templates in the coprecipitation of pirochromite. The structure evolution, microstructure and optical properties of the ESM templated MgCr 2 O 4 nanomaterial were studied by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, Energy dispersive X-ray spectroscopy, elemental mapping and UV-Vis-NIR spectrophotometry. The annealing of the untemplated and templated co-precipitated MgCr 2 O 4 powders at 1000°C for 4 h produced single phased nanostructured material with spinel cubic crystal structure. The FTIR results showed slight variations in the band positions m 1 and m 2 which are attributed to the change in the microstructure due to the introduction of ESM in the preparation of MgCr 2 O 4 . The morphologies and average crystallite size of the annealed MgCr 2 O 4 nanocrystalline powders depended on the type of the template. 3D hierarchical flake-like and mesh like structures were observed. The annealed MgCr 2 O 4 nanocrystalline powders have shown excitonic absorptions in the visible range 300-500 nm due to the transitions that took place from the O-2p level to the Cr-3d level. The optical band gap energies were found to be 3.68-3.71 eV for the direct band gap and 3.30-3.37 eV for the indirect band gap. This could make these MgCr 2 O 4 nanocrystalline powders possible photocatalysts in the visible range 300-500 nm.

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Section: Heat Treatmentssupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Synthesis of nanostructured pirochromite magnesium chromate with egg shell membrane template

Ramachandran

Hamed

2016

Appl Nanosci

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“…The degree of the ionic packing of the spinel structure can be determined using the fulfillment coefficient of the unit cell, α , which can be estimated using the following relation [35]: …”

Section: Resultsmentioning

confidence: 99%

“…It is a measure of the total vacancy concentration existing in the material and can be estimated using the following equation [34, 35]: …”

Section: Resultsmentioning

confidence: 99%

Structural, Optical, and Magnetic Properties of Zn-Doped CoFe2O4 Nanoparticles

et al. 2017

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The effect of Zn-doping in CoFe2O4 nanoparticles (NPs) through chemical co-precipitation route was investigated in term of structural, optical, and magnetic properties. Both XRD and FTIR analyses confirm the formation of cubic spinel phase, where the crystallite size changes with Zn content from 46 to 77 nm. The Scherrer method, Williamson-Hall (W-H) analysis, and size-strain plot method (SSPM) were used to study of crystallite sizes. The TEM results were in good agreement with the results of the SSP method. SEM observations reveal agglomeration of fine spherical-like particles. The optical band gap energy determined from diffuse reflectance spectroscopy (DRS) varies increases from 1.17 to 1.3 eV. Magnetization field loops reveal a ferromagnetic behavior with lower hysteresis loop for higher Zn content. The magnetic properties are remarkably influenced with Zn doping; saturation magnetization (Ms) increases then decreases while both coercivity (HC) and remanent magnetization (Mr) decrease continuously, which was associated with preferential site occupancy and the change in particle size.

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“…The physical properties can be altered by introducing the different metallic ions results the cations distribution modification on the A-and B-sites. The factors that determine cation distributions are ionic radius, charge, site preference and level of substituent ion, methods, conditions and sintering temperature for the preparation of ferrites [19][20][21][22].Study of ferrites usually in most cases has been limited to their structural, electrical and magnetic properties [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. However, study of mechanical properties of ferrites has scientific importance due to their potential applications in industry and in research field.…”

mentioning

confidence: 99%

Mechanical behavior, enhanced dc resistivity, energy band gap and high temperature magnetic properties of Y-substituted Mg–Zn ferrites

Ali

Khan

Hossain

et al. 2020

Mater. Res. Express

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We report the synthesis of Y-substituted Mg-Zn [Mg 0.5 Zn 0.5 Y x Fe 2−x O 4 (0x0.05)] ferrites using conventional standard ceramic technique. The samples were characterized by x-ray diffraction (XRD) analysis, field emission scanning electron microscopy (FESEM), FTIR spectroscopy, UV-Vis spectroscopy and quantum design physical properties measurement system (PPMS). XRD patterns confirm the single phase cubic spinel structure up to x=0.03 and appearance of a secondary phase of YFeO 3 for higher Y contents. FESEM images depict the distribution of grains and EDS spectra confirmed the absence of any unwanted element. Completion of solid state reaction and formation of spinel structure has been revealed from FTIR spectra. The FTIR data along with lattice constant, bulk density and porosity were further used to calculate the stiffness constant (C ij ), elastic constant and Debye temperatures. Mechanical stability of all studied compositions is confirmed from C ij using Born stability conditions. Brittleness and isotropic nature are also confirmed using Poisson's ratio and anisotropy constants, respectively. The enhancement of dc electrical resistivity (10 5 Ω cm to 10 6 Ω cm) with Y content is observed. The energy band gap (increased with Y contents) is found in good agreement with dc electrical resistivity. Ferrimagnetic to paramagnetic phase change has been observed from the field dependent high temperature magnetization curves. The magnetic moments and saturation magnetization were found to be decreased with increasing temperature. The Curie temperature (T c ) has been measured from temperature dependent magnetic moment (M-T) and initial permeability (μ′ i -T) measurements and found to be in good agreement with each other. Decrease in T c with Y content is due to redistribution of cations and weakening of the exchange coupling constant. The magnetic phase transition has been analyzed by Arrott plot and found to have second order phase transition. The dc resistivity endorses the prepared ferrites are suitable for high frequency and high temperature magnetic device applications as well.Mg-Zn ferrite is one of the most used soft ferrites because of its high electrical resistivity, low cost, low dielectric loss, high mechanical hardness and superior environmental stability [13]. Mg-Zn ferrites with higher resistivity (10 6 -10 7 Ω cm) make its suitability in high frequency applications [13]. Most of (∼ 90%) Mg 2+ ions are located on the B-sites and small fraction (∼10%) occupies in the A-sites [14,15]. However, the Zn 2+ ions have a preference to occupy A-sites in the spinel lattice [16,17]. The Fe 3+ ions are distributed on both A-and B-sites [18]. Therefore, the physical properties of the Mg-Zn ferrites are determined by the cations distribution over the A-and B-sites. The physical properties can be altered by introducing the different metallic ions results the cations distribution modification on the A-and B-sites. The factors that determine cation distributions are ionic radius, charge, site preference and le...

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Influence of Zn 2+ ions on the structural and electrical properties of Mg 1−x Zn x FeCrO 4 spinels

Cited by 61 publications

References 25 publications

Synthesis of nanostructured pirochromite magnesium chromate with egg shell membrane template

Synthesis of nanostructured pirochromite magnesium chromate with egg shell membrane template

Structural, Optical, and Magnetic Properties of Zn-Doped CoFe2O4 Nanoparticles

Mechanical behavior, enhanced dc resistivity, energy band gap and high temperature magnetic properties of Y-substituted Mg–Zn ferrites

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