Exploring the structural, Mössbauer and dielectric properties of Co2+ incorporated Mg0.5Zn0.5−xCoxFe2O4 nanocrystalline ferrite

Hashim, Mohd.; Meena, Sher Singh; Kotnala, R.K.; Shirsath, Sagar E.; Bhatt, Pramod; Kumar, Shalendra; Şentürk, E.; Kumar, Ravi; Gupta, Nandini; Alimuddin, Alimuddin

doi:10.1016/j.jmmm.2014.01.047

Cited by 60 publications

(17 citation statements)

References 31 publications

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“…The substitution of Y ions in the spinel structure leads to increase in the bond lengths and distance between ions presents at the A-and B-sites that results a decrease in exchange constants and hence the T c values [34]. The T c value for the Mg 0.5 Zn 0.5 Fe 2 O 4 (x=0.00) is obtained from the M-T graph and μʹ i -T graph and found to be 77°C and 75°C, respectively which is higher than that of (T c ∼ 47°C) reported by Khot et al [86] and Hashim et al [44] and lower than that of (T c ∼97°C) obtained by Mazen et al [87].…”

Section: Curie Temperaturementioning

confidence: 67%

“…In addition, determination of band gap of semiconducting materials is very important for their practical application. Therefore, the present paper reports the investigation of mechanical properties, high temperature magnetic properties along with FTIR spectra and UV-vis measurement of Mg-Zn ferrites.Mg-Zn ferrites have been subjected by a large number of research group to modify the different properties using different synthesis routes and conditions [12,14,[35][36][37][38][39][40][41][42][43][44][45][46][47][48][49], where some of them are dealt with tailoring electrical properties and/or magnetic properties of Mg-Zn ferrites. The motivation of our present research is to enhance the electrical resistivity of the Mg-Zn ferrites by Y 3+ substitution for Fe 3+ with favorable magnetic properties that is one of the significant characteristics of ferrites for applications in high frequency devices.…”

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confidence: 99%

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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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Section: Curie Temperaturementioning

confidence: 67%

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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“…The crystal size of the nanoparticles was further determined and verified by X-ray diffraction using Scherer's formula (Hashim et al 2014). The calculated particle size was about 20 nm, similar to the results obtained by scanning electron microscopy.…”

Section: X-ray Diffraction Of Silver Nanoparticlesmentioning

confidence: 99%

“…Green synthesis is an arising field in nanotechnology for the preparation of metallic nanoparticles. Instead of using a synthetic chemical reducing agent, a plant extract containing polyphenols is used as the reductant (Hashim et al 2014;Ahluwalia et al 2014;Jagtap and Bapat 2013;Forough and Fahadi 2011). The use of these natural materials offers low cost, reduced toxicity, and low temperature, pressure, and energy requirements.…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis and Characterization of Silver Nanoparticles UsingFerocactus echidneExtract as a Reducing Agent

et al. 2015

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The green synthesis of silver nanoparticles using an aqueous extract of Ferocactus echidne (a member of the cactus family) as a reducing agent is reported. It is simple, efficient, rapid, and ecologically friendly compared to chemical-mediated methods.Ferocactus echidne is a plant of high medicinal value and rich in polyphenolic antioxidants. The extraction is simple and the product rapidly reduces silver ions without involvement of any external chemical agent. The reduction of silver nanoparticles was characterized by ultraviolet-visible spectrometry as a function of time and concentration.The results show that Ferocactus echidne reduces silver ions within 6 h depending upon the concentration. Further increases in reaction time may result in a blue shift, indicating an increase in particle size, whereas concentration had a minor effect on the particle size.The structure of synthesized nanoparticles was investigated by infrared spectroscopy, scanning electron microscopy, and X-ray diffraction. The infrared spectra indicated the Downloaded by [University of Western Ontario] at 13:29 07 February 20152 association of organic materials with silver nanoparticles to serve as capping agents.Scanning electron micrographs showed that synthesized silver nanoparticles were nearly uniform and elliptical in shape with diameters of 20 to 60 nm. X-ray diffraction confirmed the formation of silver nanoparticles with an approximate 20 nm particle size calculated using the Debye-Scherer equation. Biological tests revealed that the silver nanoparticles were active against gram positive and negative bacteria (Escherichia coli and Staphylococcus aureus) and fungi (Candida albicans), indicating their broad spectrum antibiotic and antifungal abilities.

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“…18 The presence of cobalt and iron ions on the octahedral sites may lead to the exchange interaction of Co 2þ þ Fe 3þ $ Co 3þ þ Fe 2þ . 19,20 Moreover, the electron hopping between Fe 2þ and Fe 3þ takes an essential role in the conductivity and space charge. 21,22 Therefore, both electron transfers are co-existing, which can also be localized by the internal interfaces.…”

Section: A Phase Identification and Microstructurementioning

confidence: 99%

Analysis of the alternating current conductivity and magnetic behaviors for the polycrystalline Y-type Ba0.5Sr1.5Co2(Fe1-xAlx)12O22 hexaferrites

Zhong

Gao

et al. 2014

Journal of Applied Physics

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Co2Y hexaferrites have attracted intensive interests due to its potential high temperature magnetoelectricity as the single phase multiferroics. Numerous efforts have been paid to enhance their magnetoelectric properties at high temperatures through increasing the magnetic transition temperature and decreasing the conductivity. In this work, we investigated the conductivity and magnetic properties of the polycrystalline Ba0.5Sr1.5Co2(Fe1−xAlx)12O22 (0 ≤ x ≤ 0.12) hexaferrites and found that Al-doping has important effects on both the conductivity and magnetic properties. The underlying physical mechanisms were also systematically analyzed. Most importantly, a very much enhanced resistivity (over 10 MΩ cm), and a high magnetic transition temperature (∼346 K) have been obtained at a doping amount of x = 0.04. These improvements are very promising for achieving significant magnetoelectric effect at room temperature. The current research can provide the basic understanding of the Y-type ferrites for future applications in magnetoelectric and other fields.

show abstract

Exploring the structural, Mössbauer and dielectric properties of Co2+ incorporated Mg0.5Zn0.5−xCoxFe2O4 nanocrystalline ferrite

Cited by 60 publications

References 31 publications

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

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

Green Synthesis and Characterization of Silver Nanoparticles UsingFerocactus echidneExtract as a Reducing Agent

Analysis of the alternating current conductivity and magnetic behaviors for the polycrystalline Y-type Ba0.5Sr1.5Co2(Fe1-xAlx)12O22 hexaferrites

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