Synthesis and magnetic properties of SrFe12−x−yAlxCoyO19 nanocomposites prepared via autocombustion technique

Dahal, Jiba Nath; Wang, L.; Mishra, Sanjay R.; Nguyen, Vuong Van; Liu, J.P.

doi:10.1016/j.jallcom.2013.12.186

Cited by 31 publications

(11 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the Fe-rich R 2 Fe 17 intermetallic, the Tc is mainly determined by the strength and number of Fe-Fe exchange interactions. The strength of Fe-Fe exchange interaction is strongly dependent on the interatomic Fe-Fe distances described [9,[34][35][36]. Accordingly, the exchange interactions between iron atoms situated at distances smaller (greater) than 2.45−2.50 Å are negative (positive).…”

Section: Resultsmentioning

confidence: 99%

Structural, Magnetic, and Mössbauer Studies of Transition Metal-Doped Gd2Fe16Ga0.5TM0.5 Intermetallic Compounds (TM = Cr, Mn, Co, Ni, Cu, and Zn)

Dahal

Ali²,

Mishra

et al. 2018

Magnetochemistry

View full text Add to dashboard Cite

The effect of transition metal substitution for Fe and the structural and magnetic properties of Gd 2 Fe 16 Ga 0.5 TM 0.5 (TM = Cr, Mn, Co, Ni, Cu, and Zn) compounds were investigated in this study. Rietveld analysis of X-ray data indicates that all the samples crystallize in the hexagonal Th 2 Ni 17 structure. The lattice parameters a, c, and the unit cell volume show TM ionic radii dependence. Both Ga and TM atoms show preferred site occupancy for 12j and 12k sites. The saturation magnetization at room temperature was observed for Co, Ni, and Cu of 69, 73, and 77 emu/g, respectively, while a minimum value was observed for Zn (62 emu/g) doping in Gd 2 Fe 16 Ga 0.5 TM 0.5 . The highest Curie temperature of 590 K was observed for Cu doping which is 15 and 5% higher than Gd 2 Fe 17 and Gd 2 Fe 16 Ga compounds, respectively. The hyperfine parameters viz. hyperfine field and isomer shift show systematic dependence on the TM atomic number. The observed magnetic and Curie temperature behavior in Gd 2 Fe 16 Ga 0.5 TM 0.5 is explained on the basis of Fe(3d)-TM(3d) hybridization. The superior Curie temperature and magnetization value of Co-, Ni-, and Cu-doped Gd 2 Fe 16 Ga 0.5 TM 0.5 compounds as compared to pure Gd 2 Fe 17 or Gd 2 Fe 16 Ga makes Gd 2 Fe 16 Ga 0.5 TM 0.5 a potential candidate for high-temperature industrial magnet applications.

show abstract

Section: Resultsmentioning

confidence: 99%

Structural, Magnetic, and Mössbauer Studies of Transition Metal-Doped Gd2Fe16Ga0.5TM0.5 Intermetallic Compounds (TM = Cr, Mn, Co, Ni, Cu, and Zn)

Dahal

Ali²,

Mishra

et al. 2018

Magnetochemistry

View full text Add to dashboard Cite

show abstract

“…LSMO belonging to the hole-doped manganite family is known to be a potential candidate for technological applications as it has a ferromagnetic transition temperature T C~3 80 K and a large magnetic moment at room temperature. The auto-combustion synthesis method [20] is a unique combination of combustion and the chemical gelation processes. This method exploits the advantages of cheap precursors, simple preparation, and atomic-level diffusion and results in ultrafine, homogeneous, crystalline powder [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Exchange-Coupling Behavior in SrFe12O19/La0.7Sr0.3MnO3 Nanocomposites

2019

View full text Add to dashboard Cite

Magnetically hard-soft (100-x) SrFe12O19–x wt % La0.7Sr0.3MnO3 nanocomposites were synthesized via a one-pot auto-combustion technique using nitrate salts followed by heat treatment in air at 950 °C. X-ray diffraction (XRD), transmission electron microscopy (TEM), and vibrating sample magnetometry (VSM) were used to characterize the structural and magnetic properties of the samples. XRD spectra revealed the formation of a mixture of ferrite and magnetite phases without any trace of secondary phases in the composite. Microstructural images show the proximity grain growth of both phases. The room temperature hysteresis loops of the samples showed the presence of exchange-coupling between the hard and soft phases of the composite. Although saturation magnetization reduced by 41%, the squareness ratio and coercivity of the nanocomposite improved significantly up to 6.6% and 81.7%, respectively, at x = 40 wt % soft phase content in the nanocomposite. The enhancement in squareness ratio and coercivity could be attributed to the effective exchange-coupling interaction, while the reduction in saturation magnetization could be explained on the basis of atomic intermixing between phases in the system. Overall, these composite particles exhibited magnetically single-phase behavior. The adopted synthesis method is low cost and rapid and results in pure crystalline nanocomposite powder. This simple method is a promising way to tailor and enhance the magnetic properties of oxide-based hard-soft magnetic nanocomposites.

show abstract

“…A crystallite can spontaneously break up into a number of domains to decrease the large magnetization energy. In the single‐domain region, the coercivity decreases with a decrease in the grain size because of thermal effects, which is known as “superparamagnetism” behavior. While, in the multi‐domain region, the coercivity increases with a decrease in the particle diameter.…”

Section: Resultsmentioning

confidence: 99%

Effect of apple cider vinegar agent on the microstructure, phase evolution, and magnetic properties of CoFe₂O₄ magnetic nanoparticles

Afshari

Isfahani

Hasani

et al. 2019

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

In the present study, spinel structure CoFe2O4 nanoparticles were successfully synthesized by the sol‐gel auto‐combustion technique. The effect of apple cider vinegar (ACV) addition as an organic biocompatible agent on the size, morphology, and magnetic properties of CoFe2O4 nanoparticles was investigated in detail. The phase evolution, particle size, and lattice parameter changes of the synthesized phase have been estimated by using Rietveld structure refinement analysis of X‐ray powder diffraction data. Also, Fourier transform infrared spectra (FT‐IR) of the samples verified the presence of two expected bands correspond to tetrahedral and octahedral metal‐oxygen complexes within the spinel structure. Furthermore, microstructural observations revealed that ultrafine particles have a semi‐spherical morphology. It was shown that the particles size decreased from ~45 to ~17 nm with an increase in the amount of ACV. Magnetic properties were carried out by vibrating sample magnetometer (VSM) at room temperature. Both the saturation magnetization (Ms) and coercivity (Hc) were found to be significantly dependent on the crystallite size and the amount of ACV.

show abstract

Synthesis and magnetic properties of SrFe12−x−yAlxCoyO19 nanocomposites prepared via autocombustion technique

Cited by 31 publications

References 50 publications

Structural, Magnetic, and Mössbauer Studies of Transition Metal-Doped Gd2Fe16Ga0.5TM0.5 Intermetallic Compounds (TM = Cr, Mn, Co, Ni, Cu, and Zn)

Structural, Magnetic, and Mössbauer Studies of Transition Metal-Doped Gd2Fe16Ga0.5TM0.5 Intermetallic Compounds (TM = Cr, Mn, Co, Ni, Cu, and Zn)

Exchange-Coupling Behavior in SrFe12O19/La0.7Sr0.3MnO3 Nanocomposites

Effect of apple cider vinegar agent on the microstructure, phase evolution, and magnetic properties of CoFe₂O₄ magnetic nanoparticles

Contact Info

Product

Resources

About

Synthesis and magnetic properties of SrFe12−x−yAlxCoyO19 nanocomposites prepared via autocombustion technique

Cited by 31 publications

References 50 publications

Structural, Magnetic, and Mössbauer Studies of Transition Metal-Doped Gd2Fe16Ga0.5TM0.5 Intermetallic Compounds (TM = Cr, Mn, Co, Ni, Cu, and Zn)

Structural, Magnetic, and Mössbauer Studies of Transition Metal-Doped Gd2Fe16Ga0.5TM0.5 Intermetallic Compounds (TM = Cr, Mn, Co, Ni, Cu, and Zn)

Exchange-Coupling Behavior in SrFe12O19/La0.7Sr0.3MnO3 Nanocomposites

Effect of apple cider vinegar agent on the microstructure, phase evolution, and magnetic properties of CoFe2O4 magnetic nanoparticles

Contact Info

Product

Resources

About

Effect of apple cider vinegar agent on the microstructure, phase evolution, and magnetic properties of CoFe₂O₄ magnetic nanoparticles