Effects on structural, optical, and magnetic properties of pure and Sr-substituted MgFe2O4 nanoparticles at different calcination temperatures

Loganathan, Archana; Kumar, K. Shiva

doi:10.1007/s13204-015-0480-0

Cited by 75 publications

(12 citation statements)

References 38 publications

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“…10, the values of the direct optical gap energy of the Fe 3 O 4 nanoparticles are increasing with increasing NaOH concentration. This result is contradictive compared to the result reported by (Dhas, et al, 2015;Heiba, et al, 2015;Loganathan & Kumar, 2016). The indirect optical gap energy also increases with increasing NaOH concentration.…”

Section: Absorbance Spectra and Optical Propertiesmentioning

confidence: 59%

A COMPREHENSIVE STUDY ON THE MICROSTRUCTURE AND OPTICAL PROPERTIES OF Fe3O4 NANOPARTICLES BY VARIATION OF TEMPERATURE AND NaOH CONCENTRATION

Indrayana

2019

JoP

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This work was aimed at optimizing the microstructure and optical properties of Fe3O4 by variation of synthesis temperature and NaOH concentration. The nanoparticles have been synthesized from iron sand by using the coprecipitation method. The temperature was varied of 60oC, 80oC, and 100oC, while NaOH concentration was 3 molar, 5 molar, and 7 molars. The microstructural parameters were characterized by using X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) techniques. The optical properties were characterized by using Fourier Transform Infrared Spectroscopy (FTIR) and UV-Vis Spectroscopy, consecutively. The results showed that the crystallite size of Fe3O4 increase with an increase of synthesis temperature due to higher thermal energy driving the nucleation process. The crystallite sizes are in the range of 3.77 nm – 20.37 nm. Increasing NaOH concentration also affected the increase in crystallite sizes. On the other hand, an excess of NaOH concentration influences the formation of smaller crystallite sizes of Fe3O4 with smaller crystal density and larger microstrain. The existence of Fe2+-O and Fe3+-O vibration in FTIR spectra confirmed the formation of Fe3O4 nanoparticles. The direct and indirect optical gap energies of Fe3O4 were in the range of 3.15 eV – 3.39 eV and 2.39 eV – 2.91eV. The synthesis temperature and NaOH concentration have a significant role in controlling the properties of Fe3O4.

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Section: Absorbance Spectra and Optical Propertiesmentioning

confidence: 59%

A COMPREHENSIVE STUDY ON THE MICROSTRUCTURE AND OPTICAL PROPERTIES OF Fe3O4 NANOPARTICLES BY VARIATION OF TEMPERATURE AND NaOH CONCENTRATION

Indrayana

2019

JoP

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“…They observed higher permeabilty and lower magnetization for Nd doped Cu-Zn ferrites as compared to undoped ferrites. Loganathan et al [11] showed that structural, optical, and magnetic properties of Sr-substituted magnesium ferrites strongly depend on calcination temperature. Effect of thermal processing on the tribological of nanocrystalline Ni/TiO 2 coatings have been reported Cooke and Khan.…”

Section: Introductionmentioning

confidence: 99%

Thermal and Frequency Variation of Permeability for Samarium–Dysprosium–Magnesium Ferrite

Kumbhar

Shinde

Ghodake

2019

Macromolecular Symposia

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Samarium–dysprosium–magnesium ferrite materials have been prepared by chemical combustion method. The effect of samarium–dysprosium rare earth ions on loss factor, real and imaginary part of permeability has been studied for Mg[(Sm)0.6(Dy)0.4]xFe2−xO4 (x = 0.01 and x = 0.03) ferrite materials with temperature and frequency by using a Hioki LCR‐Q meter. From thermal variation of loss factor of prepared ferrite materials, it is revealed that ferrite must be used below Curie temperature for low loss factor. The real part of initial permeability initially increases with frequency and for higher frequency its value almost remains constant. The loss factor and an imaginary part of permeability of the ferrite materials decreases with increasing frequency.

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“…[14] The lattice constant (a) was decreased with the increase of Al 3+ content, evidenced by the smaller ionic radii of the Al 3+ ions (0.67 Å) than the Cu 2+ ion (0.73 Å) and the Zn 2+ ion (0.83 Å). The observed larger lattice parameter (8.3958 Å) of F 1 may be due to the strong interactions between Al- nanoferrites, which may be due to the magnetic interactions between the particles of ferrites and the limited magnification power of this device [16] or to the magnetic exchange interaction between the nanoparticles [17].…”

Section: Methodsmentioning

confidence: 99%

Synthesis and Characterization of AlyCu0.15Zn0.85-yFe2O4 Ferrite Prepared by the Sol-Gel Method

Al‐Saadi¹

2018

International Journal of Electrochemical Science

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Nano powder of zinc ferrite with the chemical formula Al y Cu 0.15 Zn 0.85-y Fe 2 O 4 (y = 0.15, 0.30, 0.45, 0.60, 0.75) was synthesized by the sol-gel/auto combustion technique. The average crystallite size was found to be in the range of 28.82-42.27 nm, and the lattice constant decreased from 8.3958 to 8.2966 Å, while the density increased from 5.271 to 5.386 g/cm 3 with increasing Al content. The dielectric loss factor (ɛ″), dielectric constant (ɛ′) and AC electric conductivity (σ a.c) were studied, and it was found that (ɛ′) and (ɛ″) decreased with increasing frequency, while the behavior of conductivity was the opposite. It was also found that there was a variation in the behavior of (ɛ′), (ɛ″) and (σ a.c) based on Al content, and the highest values were found for the sample with an Al content of x= 0.3.

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Effects on structural, optical, and magnetic properties of pure and Sr-substituted MgFe2O4 nanoparticles at different calcination temperatures

Cited by 75 publications

References 38 publications

A COMPREHENSIVE STUDY ON THE MICROSTRUCTURE AND OPTICAL PROPERTIES OF Fe3O4 NANOPARTICLES BY VARIATION OF TEMPERATURE AND NaOH CONCENTRATION

A COMPREHENSIVE STUDY ON THE MICROSTRUCTURE AND OPTICAL PROPERTIES OF Fe3O4 NANOPARTICLES BY VARIATION OF TEMPERATURE AND NaOH CONCENTRATION

Thermal and Frequency Variation of Permeability for Samarium–Dysprosium–Magnesium Ferrite

Synthesis and Characterization of AlyCu0.15Zn0.85-yFe2O4 Ferrite Prepared by the Sol-Gel Method

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