Structural, magnetic and dielectric properties of Zr–Cd substituted strontium hexaferrite (SrFe12O19) nanoparticles

Ashiq, Muhammad Naeem; Iqbal, Muhammad Javed; Gul, Iftikhar Hussain

doi:10.1016/j.jallcom.2009.07.140

Cited by 173 publications

(53 citation statements)

References 40 publications

(39 reference statements)

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“…In addition to these, they exhibit ferrimagnetism, originating from the magnetic moment of anti-parallel spins between Fe 3+ ions at tetrahedral sites and Co 2+ or Ni 2+ ions at octahedral sites. 1 Due to the magnetic properties, ferrite have various applications in numerous fields including microwave devices, 2 recording media, 3 magnetic fluids, 4 gas sensors, 5 high density information storage, 6 ferro-fluids 7 and catalysts. 8 Literature contains several physical as well as chemical method to synthesize the spinel ferrites like solid-state reaction, 9 high energy ball milling, 10 sol-gel, 11 hydrothermal synthesis, 12 chemicalcoprecipitation, 13 combustion synthesis, 14 micro-emulsion 15 and microwave hydrothermal.…”

Section: Introductionmentioning

confidence: 99%

Structural, dielectric and magnetic properties of nickel substituted cobalt ferrite nanoparticles: Effect of nickel concentration

et al. 2015

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Microstructure and magnetic properties of MFe 2 O 4 (M = Co, Ni, and Mn) ferrite nanocrystals prepared using colloid mill and hydrothermal method Journal of Applied Physics 117, 17A328 (2015) Nickel substituted cobalt ferrite nanoparticles with composition Co 1−x Ni x Fe 2 O 4 (0.0≤x≤1.0) was synthesized using simple, low temperature auto combustion method. The X-ray diffraction patterns reveal the formation of cubic phase spinel structure. The crystallite size varies from 30-44 nm with the nickel content. Porous and agglomerated morphology of the bulk sample was displayed in the scanning electron microscopy. Micro Raman spectroscopy reveals continuous shift of E g and E g (2) stokes line up to 0.8 Ni substitution. The dispersion behavior of the dielectric constant with frequency and the semicircle nature of the impedance spectra show the cobalt nickel ferrite to have high resistance. The ferromagnetic nature is observed in all the samples, however, the maximum saturation magnetization was achieved by the 0.4 Ni substituted cobalt ferrite, which is up to the 92.87 emu/gm at 30K. C 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License. [http://dx

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Section: Introductionmentioning

confidence: 99%

Structural, dielectric and magnetic properties of nickel substituted cobalt ferrite nanoparticles: Effect of nickel concentration

et al. 2015

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“…The ac conductivity (σ ac , (Ω·m) −1 ) was calculated from the dielectric data, using the following relationship [9]: σ ac = ε′ε 0 ωtanδ (12) The permeability (μ, H/m) was calculated from the following formula:…”

Section: Characterizationmentioning

confidence: 99%

“…Furthermore, the X-ray density directly depends on the molar mass of the sample (see Eq. (2)) [9,13]. The average values of D were calculated in terms of the Scherer formula.…”

Section: Characterizationmentioning

confidence: 99%

Fabrication of SrFe12−x Ni x O19 nanoparticles and investigation on their structural, magnetic and dielectric properties

Ghahfarokhi

Hosseini

Shoushtari

2015

Int J Miner Metall Mater

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SrFe 12−x Ni x O 19 nanoparticles (x = 0-1) were synthesized by a combustion sol-gel method. Their structure, dielectric and magnetic properties were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), an LCR metry, and vibrating sample magnetometry (VSM).The results reveal that all samples of Ni doped compounds (SrFe 12−x Ni x O 19 ) with x < 0.2 are single phase. It appears that the Fe 3+ ions are substituted by Ni 2+ ions on the crystallographic sites of the SrFe 12 O 19 structure; however, for x ≥ 0.2, the secondary Ni phase ferrite (NiFe 2 O 3 ) appears, which reduces the saturation magnetization and coercivity. In addition, Ni doping reduces the dielectric constant, dielectric loss, and alternating current (ac) electrical conductivity of the samples. The variation in ac conductivity (σ ac ) with frequency shows that the electrical conductivity in these ferrites is mainly attributed to the electron hopping mechanism.Therefore; all the single-phase Ni doped samples are suitable for use in magnetic recording media and microwave devices.

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“…They represented the electric transport phenomena of these systems by impedance and modulus formalizes. But they could not represent the distinct conduction/relaxation regions of grain, grain boundary and surface charge effect clearly [15]. Iqbal et al prepared calcium-substituted strontium hexaferrite by chemical co-precipitation method and studied the electrical properties with variation of calcium continent only at room temperature [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of grain size on electric transport and magnetic behavior of strontium hexaferrite (SrFe12O19)

et al. 2016

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Polycrystalline M-type hexagonal strontium hexaferrite (SrFe 12 O 19 ) was prepared by conventional ceramic route (LG SrM) and auto combustion (SG SrM) method. The single-phase pattern and well grain growth was confirmed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The average crystalline size is found to be 41.35 nm in LG SrM, while that of SG SrM is 36.87 nm. In this report, the electric transport behavior of LG SrM and SG SrM (SrFe 12 O 19 ) was successfully investigated and the analysis is done in the frequency range 100 Hz to 1 MHz at temperature 30-200°C. The relaxation behavior was examined by considering the impedance and modulus formalism in order to investigate the grain and grain boundary and surface polarization conduction process. The magnetic properties such as saturation magnetization, remanence, coercivity and anisotropy field are calculated from the hysteresis loop measurement. It was found that the saturation magnetization gets increased in LG SrM as compared to SG SrM system while the coercivity of SG SrM is greater than that of LG SrM.

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Structural, magnetic and dielectric properties of Zr–Cd substituted strontium hexaferrite (SrFe12O19) nanoparticles

Cited by 173 publications

References 40 publications

Structural, dielectric and magnetic properties of nickel substituted cobalt ferrite nanoparticles: Effect of nickel concentration

Structural, dielectric and magnetic properties of nickel substituted cobalt ferrite nanoparticles: Effect of nickel concentration

Fabrication of SrFe12−x Ni x O19 nanoparticles and investigation on their structural, magnetic and dielectric properties

Effect of grain size on electric transport and magnetic behavior of strontium hexaferrite (SrFe12O19)

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