Effects of La3+–Nd3+ ions and pre-calcination on the growth of hexaferrite nanoparticles prepared by gel to crystallization technique: Non-isothermal crystallization kinetics analysis

Thakur, Ankush; Barman, P. B.; Singh, Ragini Raj

doi:10.1016/j.matchemphys.2015.02.015

Cited by 15 publications

(5 citation statements)

References 39 publications

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“…The peak shift towards the higher frequency for the yttrium doped strontium hexaferrite can be attributed to the distribution of higher ionic radii dopant at crystallographic site of Fe 3+ ions that may alter the bond length at interstitial sites of the crystal. This is because Y 3+ ions preferably occupy the octahedral site causing higher shift and decrement in bond length that can be clearly observed from FTIR spectrum as absorption intensity found to be decreased and broadening get increased for substituent [18,19]. The results are well consistent with structural analysis as spectroscopic investigation reveals that the system is disorder.…”

Section: Ftir Analysissupporting

confidence: 74%

“…Incorporation of Y 3+ (µB=0) ions by Fe 3+ ions decreases the magnetic moment and the difference in ionic radii Y 3+ (0.090 nm) and Fe 3+ (0.064 nm) causes reduction of exchange interactions of Fe 3+ -O 2--Fe 3+ that results in decrement in magnetic parameter. The obtained values of Y 3+ substituted strontium hexaferrite nanomaterial reveal it to be a promising material for the application in longitudinal recording media [19][20][21].…”

Section: Vsm Analysismentioning

confidence: 83%

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Yttrium doped strontium nano hexaferrites: Influence of yttrium on the structural and magnetic properties of sol-gel synthesized nanocrystalline strontium hexaferrite

Sharma¹,

Kumar

Gewali

et al. 2022

J. Phys.: Conf. Ser.

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Yttrium (Y3+)-substituted strontium hexaferrite nanoparticles with composition SrFe12-x Y x O19 have been synthesized using the sol-gel method. Diverse analytical tools have been applied to characterize the prepared strontium hexaferrite nanoparticles and to analyse the influence of yttrium (Y3+) substitution on the structural and magnetic properties. X-ray diffraction patterns confirm the presence of single phase M-type hexagonal crystalline structure. In fourier-transform infrared spectroscopy, the absorption bands at low wavenumber confirmed the formation of hexagonal ferrites. The vibrating sample magnetometer has been employed to study the magnetic behavior of Y3+ ions substituted strontium hexaferrite. The decrease in saturation magnetization (Ms) and coercivity (Hc) value has been explained on the basis of alteration in magnetic interactions due to the replacement of both Fe3+ ions by the non-magnetic Y3+ ions.

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Section: Ftir Analysissupporting

confidence: 74%

Section: Vsm Analysismentioning

confidence: 83%

Yttrium doped strontium nano hexaferrites: Influence of yttrium on the structural and magnetic properties of sol-gel synthesized nanocrystalline strontium hexaferrite

Sharma¹,

Kumar

Gewali

et al. 2022

J. Phys.: Conf. Ser.

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“…Many schemes34567 have been attempted in the past few decades to improve the intrinsic magnetic properties of barium hexaferrites. The typical representative is La-based substitutions8910. La-substitutions, which are benefit to improve the saturation magnetization and magnetocrystalline anisotropy, however, are detrimental to enhance the Curie temperature891011.…”

mentioning

confidence: 99%

“…The typical representative is La-based substitutions8910. La-substitutions, which are benefit to improve the saturation magnetization and magnetocrystalline anisotropy, however, are detrimental to enhance the Curie temperature891011. With the requirements of wide operating temperature range of microwave devices and components, it is very important to quantitatively explore the relationship between the Curie temperature T c and exchange integrals.…”

mentioning

confidence: 99%

Calculation of exchange integrals and Curie temperature for La-substituted barium hexaferrites

Zhao

Sun

et al. 2016

Sci Rep

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As the macro behavior of the strength of exchange interaction, state of the art of Curie temperature Tc, which is directly proportional to the exchange integrals, makes sense to the high-frequency and high-reliability microwave devices. Challenge remains as finding a quantitative way to reveal the relationship between the Curie temperature and the exchange integrals for doped barium hexaferrites. Here in this report, for La-substituted barium hexaferrites, the electronic structure has been determined by the density functional theory (DFT) and generalized gradient approximation (GGA). By means of the comparison between the ground and relative state, thirteen exchange integrals have been calculated as a function of the effective value Ueff. Furthermore, based on the Heisenberg model, the molecular field approximation (MFA) and random phase approximation (RPA), which provide an upper and lower bound of the Curie temperature Tc, have been adopted to deduce the Curie temperature Tc. In addition, the Curie temperature Tc derived from the MFA are coincided well with the experimental data. Finally, the strength of superexchange interaction mainly depends on 2b-4f1, 4f2-12k, 2a-4f1, and 4f1-12k interactions.

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“…Nano-hexaferrites have been prepared using La-Nd, Mn-Y, Zr-Nd and Sm-Er co-dopants [13][14][15][16]. The co-doping for the magnetization enhancement of Sr-hexaferrites has been performed by Al-Ce, Nb-Y, Ce-Zn, Ce-Mn, La-Co and Dy-Al and in these studies sol-gel, coprecipitation and low temperature sintering methods have been carried out [17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Effect of Rare-Earth Co-Doping on the Microstructural and Magnetic Properties of BaFe₁₂O₁₉

Güler

Ertuǧ

Işıkcı

et al. 2020

Advances in Materials Science

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Ba0.85(La,Y)0.15Fe12O19 hexaferrite magnets were produced using the powder metallurgy method. The phase analysis of the ferrite magnets was carried out by X-ray diffraction (XRD) technique. A single hexaferrite phase was present in both samples as revealed by XRD patterns. The microstructural evolution in the hexaferrite samples was examined using Scanning Electron Microscopy (SEM) equipped with Energy Dispersive X-Ray Spectroscopy (EDS). The grain morphology altered with the sintering temperature. Room temperature ferrimagnetic hysteresis curves were obtained by Vibrating Sample Magnetometer (VSM). The crystallite size and the lattice parameters (a,c) were also calculated after sintering at 1150ºC and 1250ºC. Saturation magnetizations, Ms were determined to be 48.60 emu/g and 52.95 emu/g for the samples sintered at 1150ºC and 1250ºC, respectively whereas the remanent magnetizations, Mr were 29.26 emu/g and 31.17 emu/g. The coercivity, Hc decreased from 3.95 kOe to the value of 2.44 kOe with the sintering temperature due to the increase of the crystallite size. The squareness ratios (Mr/Ms) of the ferrimagnetic samples were different because the uniaxial anisotropies altered after sintering at 1150ºC and 1250ºC. The maximum energy product, (BH)max dropped from 35.81 kJ/m3 to 27.38 kJ/m3 when the sintering temperature increased. This result can be attributed to a combination of higher magnetization and the lower coercivity.

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Effects of La3+–Nd3+ ions and pre-calcination on the growth of hexaferrite nanoparticles prepared by gel to crystallization technique: Non-isothermal crystallization kinetics analysis

Cited by 15 publications

References 39 publications

Yttrium doped strontium nano hexaferrites: Influence of yttrium on the structural and magnetic properties of sol-gel synthesized nanocrystalline strontium hexaferrite

Yttrium doped strontium nano hexaferrites: Influence of yttrium on the structural and magnetic properties of sol-gel synthesized nanocrystalline strontium hexaferrite

Calculation of exchange integrals and Curie temperature for La-substituted barium hexaferrites

Effect of Rare-Earth Co-Doping on the Microstructural and Magnetic Properties of BaFe₁₂O₁₉

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Effects of La3+–Nd3+ ions and pre-calcination on the growth of hexaferrite nanoparticles prepared by gel to crystallization technique: Non-isothermal crystallization kinetics analysis

Cited by 15 publications

References 39 publications

Yttrium doped strontium nano hexaferrites: Influence of yttrium on the structural and magnetic properties of sol-gel synthesized nanocrystalline strontium hexaferrite

Yttrium doped strontium nano hexaferrites: Influence of yttrium on the structural and magnetic properties of sol-gel synthesized nanocrystalline strontium hexaferrite

Calculation of exchange integrals and Curie temperature for La-substituted barium hexaferrites

Effect of Rare-Earth Co-Doping on the Microstructural and Magnetic Properties of BaFe12O19

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Effect of Rare-Earth Co-Doping on the Microstructural and Magnetic Properties of BaFe₁₂O₁₉