Structural analysis of Y3+-doped Mg–Cd ferrites prepared by oxalate co-precipitation method

Gadkari, Ashok B.; Shinde, Tukaram J.; Vasambekar, P. N.

doi:10.1016/j.matchemphys.2008.11.011

Cited by 158 publications

(54 citation statements)

References 22 publications

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“…The high frequency absorption band t 1 is observed in wavenumber range 593-597 cm -1 and low frequency absorption band t 2 is observed in wavenumber range 400-403 cm -1 . These bands are common characteristics of spinel ferrites [21]. The high and low frequency absorption bands are caused by the stretching vibrations of tetrahedral (A) and octahedral group (B) complexes respectively [22].…”

Section: Fourier Transform Infrared Spectrocscopy (Ft-ir)mentioning

confidence: 99%

“…The crystallite size given in Table 3 is found in the range of 27-30 nm, which confirms that the synthesized powders have a nanocrystalline nature. The cation distribution was determined from the Rietveld refinement of the occupancy values and it is given in The bond lengths (A-O and B-O) and ionic radii (r A and r B ) of tetrahedral and octahedral sites were calculated by using the equations suggested by Standley [21]. It is observed that the ionic radii on the tetrahedral site are less than that of the octahedral site.…”

Section: X-ray Diffraction and Rietveld Analysismentioning

confidence: 99%

“…inhibit the grain growth at higher concentration probably due to the fact that Dy 3? deposits on the grain boundaries which in turn hampers its motion [21].…”

Section: Fourier Transform Infrared Spectrocscopy (Ft-ir)mentioning

confidence: 99%

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Compositional variation of structural, electrical and magnetic properties of Dy substituted Ni–Co spinel ferrite

Kadam

Rajpure

2016

J Mater Sci: Mater Electron

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In the present work nanocrystalline dysprosium substituted Ni 0.8 Co 0.2 Fe 2-x Dy x O 4 (x = 0.00, 0.025, 0.050, 0.075 & 0.1) ferrite system was synthesized by the solution combustion method. The phase formation has been confirmed by Reitveld analysis of XRD patterns, which is a characteristic of spinel ferrite with most intense (311) peak. The bond lengths and site radii of tetrahedral and octahedral sites are found to increase with increase in Dy content. IR measurements showed two prominent bands which are common characteristics of spinel ferrite. The surface morphology shows spherical grains of increasing size with increase in Dy content. The dielectric measurements show the usual dielectric dispersion due to space charge polarization. The electrical resistivity of Ni-Co ferrites is found to increase with Dy content. This can be explained on the basis of formation of DyFeO 3 secondary phase along with spinel lattice. Complex impedance spectra show incomplete semicircles due to the high resistance values at low frequency. Magnetic measurements reveal low coercive field with increase in Dy content. Low coercive fields suggest the use of these materials in data storage and magnetic shielding devices.

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Section: Fourier Transform Infrared Spectrocscopy (Ft-ir)mentioning

confidence: 99%

Section: X-ray Diffraction and Rietveld Analysismentioning

confidence: 99%

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Compositional variation of structural, electrical and magnetic properties of Dy substituted Ni–Co spinel ferrite

Kadam

Rajpure

2016

J Mater Sci: Mater Electron

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“…The study of far-infrared spectra is an important tool to get the information about the position of ions in the crystal [28]. FTIR absorption spectra of the samples in the range of 3.5 × 10 4 m −1 to 8.0 × 10 4 m −1 are given in Fig.…”

Section: Ftir Studymentioning

confidence: 99%

Influence of rare-earth ions on structural and magnetic properties of CdFe2O4 ferrites

Gadkari¹,

Shinde²,

Vasambekar

2010

Rare Metals

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Nano-sized powders of rare-earth ions added CdFe 2 O 4 ferrites were synthesized by oxalate co-precipitation method. The influence of R ions (R = Sm 3+ , Y 3+ , and La 3+ ) on the microstructure and magnetic properties of CdFe 2 O 4 ferrites was studied. XRD, SEM, FTIR, and magnetic hysteresis loops were used for analyzing the samples. The addition of R ions alters the structure of the powders and decreases the crystalline size, lattice constant, and grain size. The magnetic properties such as saturation magnetization, remanent magnetization, and magnetic moment increased due to addition of rare-earth ions in CdFe 2 O 4 ferrite. The formation of secondary phase on the grain boundaries supports the abnormal growth. FTIR spectra show two absorption bands. Results suggest that the magnetic properties depend on the particular method of preparation and additives.

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“…Since rare earth (RE) ions play an important roles in determining the magneto-crystalline anisotropy in 4f-3d inter-metallic compounds [17,18], we can deduce that doping small amount of rare earth with larger radius into the ZnFe 2 O 4 can bring an important modification for both structural and magnetic properties. While, so far only a few works tried to dope RE ions into ZnFe 2 O 4 to improve their structural and magnetic properties [19][20][21][22][23][24]. For instance, Rezlescu et al pointed out that RE ions could drastically affect the physical properties of substituted ferrites due to their larger ionic radius, and when the doping contents of RE ions were relatively low, the RE ions could enter into the octahedral sites (B-sublattice) of Zn ferrites, and replace Fe 3?…”

Section: Introductionmentioning

confidence: 99%

Effects of annealing temperature on the magnetic properties of ZnFe1.97Eu0.03O4 nanoparticles

Yang

Han

Liu

et al. 2015

J Mater Sci: Mater Electron

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The ZnFe 1.97 Eu 0.03 O 4 nanoparticles were prepared with sol-gel method. The effects of sintering temperature on the structural, morphological and magnetic properties were investigated in detail. The results revealed that the ZnFe 1.97 Eu 0.03 O 4 NPs exhibited weak ferromagnetic properties due to the formation of defects in ZnFe 2 O 4 caused by Eu 3? doping. Moreover, the increased sintering temperature not only enlarged the grain size but also decreased the magnetization of ZnFe 1.97 Eu 0.03 O 4 NPs due to the decrease of defects in the crystal lattices.

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Structural analysis of Y3+-doped Mg–Cd ferrites prepared by oxalate co-precipitation method

Cited by 158 publications

References 22 publications

Compositional variation of structural, electrical and magnetic properties of Dy substituted Ni–Co spinel ferrite

Compositional variation of structural, electrical and magnetic properties of Dy substituted Ni–Co spinel ferrite

Influence of rare-earth ions on structural and magnetic properties of CdFe2O4 ferrites

Effects of annealing temperature on the magnetic properties of ZnFe1.97Eu0.03O4 nanoparticles

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