Fabrication of Co0.5Ni0.5CrxFe2−xO4 materials via sol–gel method and their characterizations

Kadam, R.H.; Birajdar, A P; Alone, S. T.; Shirsath, Sagar E.

doi:10.1016/j.jmmm.2012.09.059

Cited by 57 publications

(12 citation statements)

References 25 publications

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“…The ratio of lattice parameters c/a decreased with increasing yttrium concentration in hexaferrite. The crystallite size was calculated using Debye-Scherer equation and the most intense peak (114) [14]. The crystallite size of yttrium substituted strontium hexaferrites increased in the range of 27 to 32 nm which was very small as compared to other hexaferrites [15,16].…”

Section: Resultsmentioning

confidence: 99%

Y3+ substituted Sr-hexaferrites: sol-gel synthesis, structural, magnetic and electrical characterization

Satpute¹,

Wadgane

Kadam³

et al. 2019

Cerâmica

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Y3+ substituted strontium hexaferrites having chemical composition SrYxFe12-xO19 (x= 0.0, 0.5, 1.0, 1.5) were successfully synthesized by sol-gel auto-combustion method. The structural and morphological studies of prepared samples were investigated by using X-ray diffraction technique, energy dispersive X-ray spectroscopy, field emission scanning electron microscopy (FE-SEM) and high-resolution transmission electron microscopy. The X-ray diffraction pattern confirmed the single-phase hexagonal structure of yttrium substituted strontium ferrite and the lattice parameters a and c increased with the substitution of Y3+ ions. The crystallite size also varied with x content from 60 to 80 nm. The morphology was studied by FE-SEM, and the grain size of nanoparticles ranged from 44 to 130 nm. The magnetic properties were investigated by using vibrating sample magnetometer. The value of saturation magnetization decreased from 49.60 to 35.40 emu/g. The dielectric constant decreased non-linearly whereas the electrical dc resistivity increased with the yttrium concentration in strontium hexaferrite.

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Section: Resultsmentioning

confidence: 99%

Y3+ substituted Sr-hexaferrites: sol-gel synthesis, structural, magnetic and electrical characterization

Satpute¹,

Wadgane

Kadam³

et al. 2019

Cerâmica

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“…The obtained intensities are valid strictly at 0 K, whereas the diffraction pattern is recorded at room temperature, and hence a temperature correction might be necessary. However, the spinel ferrites, which are relatively high melting point oxides, the thermal vibration of atoms at room temperature would not significantly differ from that at 0 K. Hence, the intensity calculations were performed neglecting the temperature factor [30,31]. Best information regarding the distribution can be obtained on comparing experimental and calculated intensity ratios for reflections which are (i) nearly independent of the oxygen parameter, (ii) vary inversly with cation distribution, and (iii) do not differ significantly [30].…”

Section: Cation Distribution Studiesmentioning

confidence: 99%

“…However, the spinel ferrites, which are relatively high melting point oxides, the thermal vibration of atoms at room temperature would not significantly differ from that at 0 K. Hence, the intensity calculations were performed neglecting the temperature factor [30,31]. Best information regarding the distribution can be obtained on comparing experimental and calculated intensity ratios for reflections which are (i) nearly independent of the oxygen parameter, (ii) vary inversly with cation distribution, and (iii) do not differ significantly [30]. In this study, the planes (220), (422) (400), (440) are considered for cation distribution, as these planes are sensitive to distribution of cations among the tetrahedral and octahedral sites of the spinel lattice.…”

Section: Cation Distribution Studiesmentioning

confidence: 99%

Effect of Sintering Temperature on the Micro Strain and Magnetic Properties of Ni-Zn Nanoferrites

Venkatesh¹,

Prasad²,

Babu³

et al. 2015

Journal of Magnetics

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In this study, nanocrystalline ferrite powders with the composition Ni 0.5 Zn 0.5 Fe 2 O 4 were prepared by the autocombustion method. The obtained powders were sintered at 800 o C, 900 o C and 1,000 o C for 4 h in air atmosphere. The as-prepared and the sintered powders were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and magnetization studies. An increase in the crystallite size and a slight decrease in the lattice constant with sintering temperature were observed, whereas microstrain was observed to be negative for all the samples. Two significant absorption bands in the wave number range of the 400 cm −1 to 600 cm −1 have been observed in the FT-IR spectra for all samples which is the distinctive feature of the spinel ferrites. The force constants were found to vary with sintering temperature, suggesting a cation redistribution and modification in the unit cell of the spinel. The M-H loops indicate smaller coercivity, which is the typical nature of the soft ferrites. The observed variation in the saturation magnetization and coercivity with sintering temperature has been attributed to the role of surface, inhomogeneous cation distribution, and increase in the crystallite size.

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“…The intensities obtained from the above said method are actually valid at 0K while the xray diffraction pattern of the powder samples are recorded at room temperature and hence a temperature correction might be felt to be necessary but the spinel ferrites which are relatively high melting point oxides the thermal vibration of atoms at room temperature would not greatly differ from that at 0K. Hence, the influence of temperature might have a negligible influence on the x-ray diffraction pattern and hence the intensity calculations were performed neglecting the temperature factor [23,24] Best information regarding distribution can be obtained on comparing experimental and calculated intensity ratios for reflections which (i) are nearly independent of the oxygen parameter; (ii) vary with cation distribution in opposite ways and (iii) do not differ significantly [23] In the present study, planes (220) (422) (400) (440) are considered for cation distribution as these planes are sensitive to distribution cation among tetrahedral and octahedral sites of the spinel lattice. Reflections from planes (220) and (422) are sensitive to cations in tetrahedral sites while the planes (400) (440) are sensitive to cations on both sites.…”

Section: X-ray Diffractionmentioning

confidence: 99%

Structural and Magnetic Studies on Chromium substituted Ni-Zn Nano Ferrite Synthesized by Citrate Gel Auto Combustion Method

Prasad

Babu

Ramesh

et al. 2014

J Supercond Nov Magn

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Nano crystalline Ni 0.5 Zn 0.5 Cr x Fe 2−x O 4 particles with x varying from 0.00 to 0.25 in steps of 0.05 have been synthesized through citrate gel autocombustion method. When Ni 0.5 Zn 0.5 Fe 2 O 4 nano particles were annealed at 1000 o C, the crystallite size increased while the lattice constant decreased slightly. For, the Cr 3+ substituted samples annealed at 1000 o C, the variation in lattice constant, bondlengths, M e -M e distances and other structural parameters have been attributed to the dissimilarity in the ionic radius of the displaced (Fe 3+ ) ion and the substituted (Cr 3+ ) ion. Thermal studies indicated the autocombustion process which is an exothermic reaction between the nitrates salt solutions and the citric acid took place at about a temperature of 400 o C for Ni 0.5 Zn 0.5 Fe 2 O 4 . The M-H loops for all samples indicated a soft ferrite nature for all samples. The non-saturated hysteresis loop and high coercivity for the as prepared Ni 0.5 Zn 0.5 Fe 2 O 4 nano particles has been attributed to the core-shell structure of the fine particles. When annealed at 1000 o C the saturation magnetization of Ni 0.5 Zn 0.5 Fe 2 O 4 nano particles increased and

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Fabrication of Co0.5Ni0.5CrxFe2−xO4 materials via sol–gel method and their characterizations

Cited by 57 publications

References 25 publications

Y3+ substituted Sr-hexaferrites: sol-gel synthesis, structural, magnetic and electrical characterization

Y3+ substituted Sr-hexaferrites: sol-gel synthesis, structural, magnetic and electrical characterization

Effect of Sintering Temperature on the Micro Strain and Magnetic Properties of Ni-Zn Nanoferrites

Structural and Magnetic Studies on Chromium substituted Ni-Zn Nano Ferrite Synthesized by Citrate Gel Auto Combustion Method

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