The influence of Nd–Co substitution on the magnetic properties of non-stoichiometric strontium hexaferrite nanoparticles

Bercoff, Paula G.; Herme, Carlos; Jacobo, Silvia E.

doi:10.1016/j.jmmm.2009.01.033

Cited by 66 publications

(36 citation statements)

References 19 publications

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“…7 that the hysteresis loop area decreases with increasing Ni doping. In addition, it has been reported that a squareness ratio (M r /M s ) at or above 0.5 indicates a magnetic domain below 0.5 due to the formation of multi-domain structure [17]. In this paper, the squareness ratio (M r /M s ) is about 0.5, indicating that all samples are in the single magnetic domain.…”

Section: Structural Propertiesmentioning

confidence: 73%

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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Section: Structural Propertiesmentioning

confidence: 73%

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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“…Many attempts have been done to improve the magnetic properties of M-type hexaferrites by cation substitution [5][6][7][8][9][10][11][12][13][14][15][16][17]. It has been reported that the coercivity of M-type hexaferrites can be increased by partial substitutions of Sr 2+ or Ba 2+ ions by La 3+ , Nd 3+ , Sm 3+ , Pr 3+ , Ho 3+ , Gd 3+ and Dy 3+ ions, and of Fe 3+ ions by Al 3+ and Cr 3+ ions [5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…It has been reported that the coercivity of M-type hexaferrites can be increased by partial substitutions of Sr 2+ or Ba 2+ ions by La 3+ , Nd 3+ , Sm 3+ , Pr 3+ , Ho 3+ , Gd 3+ and Dy 3+ ions, and of Fe 3+ ions by Al 3+ and Cr 3+ ions [5][6][7][8][9][10][11][12][13]. It is also reported that La-Co or Nd-Co substitutions can improve both the saturation magnetization or remanence and coercivity, while La-Cu or La-Zn substitutions lead to the increase of the magnetization or remanence and the decrease of the coercivity [14][15][16][17]. In order to avoid formation of impurity phases like hematite (␣-Fe 2 O 3 ) and obtain suitable magnetic properties, it is important to find the optimal Fe content.…”

Section: Introductionmentioning

confidence: 99%

Influence of stoichiometry on the phase constitution and magnetic properties of M-type Sr-Ca hexaferrites

Yang

Wang

Shao

2016

Optik

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“…sublattices, namely tetrahedral (4f1), trigonal bipyramidal (2b) and octahedral (12k, 2a and 4f2) of hexagonal structure [5]. Various researchers doped different metals and combinations of various metal cations to improve the properties of strontium hexaferrites and to make the materials suitable for different applications [5][6][7][8][9][10][11][12][13][14] Hooda et al synthesized strontium hexaferrite (SrM) and its modified systems by solid-state technique. They represented the electric transport phenomena of these systems by impedance and modulus formalizes.…”

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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The influence of Nd–Co substitution on the magnetic properties of non-stoichiometric strontium hexaferrite nanoparticles

Cited by 66 publications

References 19 publications

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

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

Influence of stoichiometry on the phase constitution and magnetic properties of M-type Sr-Ca hexaferrites

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

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