Magnetic and structural properties of BaFe12−xGaxO19 nanoparticles

Bsoul, Ibrahim; Mahmood, Sami H.

doi:10.1016/j.jallcom.2009.09.024

Cited by 116 publications

(44 citation statements)

References 29 publications

(29 reference statements)

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“…These values indicate that the synthesized powders consist of single domain magnetic nanoparticles with a relatively narrow particle size distribution. The initial magnetization of the pure sample was checked and found to increase slowly at low fields followed by a rapid increase at higher fields [24]. This behavior is typical for randomly oriented single domain magnetic particles.…”

Section: Fig 2 Tem Images Of Bafementioning

confidence: 94%

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Hopkinson peak and superparamagnetic effects in BaFe_12-xGa_xO₁₉nanoparticles

Mahmood

Bsoul

2012

EPJ Web of Conferences

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Abstract. In this article, the thermomagnetic properties of a system of Ga-substituted barium hexaferrite nanoparticles (BaFe 12-x Ga x O 19 ) prepared by ball milling were investigated. The thermomagnetic curves for the samples with x ranging from 0.0 to 1.0 exhibited sharp peaks with high magnetization just below T C (Hopkinson peaks). The height of the peak for our samples was similar or larger than previously observed or calculated values. Theoretical treatment of the experimental data demonstrated that the peaks are due to the effect of superparamagnetic relaxations of the magnetic particle. This effect was confirmed by hysteresis measurements at, and just below the temperature at which the peak occurred. Consequently, the particle diameters were calculated from the experimental data using a theoretical model based on the superparamagnetic behavior of a system of uniaxial, randomly oriented, single domain, non-interacting particles. The calculated diameters of 11 -26 nm are less than the physical diameters determined from TEM measurements. The factors responsible for the low calculated values are discussed.

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Section: Fig 2 Tem Images Of Bafementioning

confidence: 94%

“…The samples were characterized using XRD and transmission electron microscopy (TEM), and the magnetic measurements were performed using a vibrating sample magnetometer (VSM). For further details on the experimental procedures the reader is referred to our earlier publication [24]. …”

Section: Methodsmentioning

confidence: 99%

Hopkinson peak and superparamagnetic effects in BaFe_12-xGa_xO₁₉nanoparticles

Mahmood

Bsoul

2012

EPJ Web of Conferences

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“…Different cations such as Al [17], Ga, Sc, In [18,19], and various cationic combination such as, Ni-Ti [20], Co-Zr [21], Co-Sn [22], Zr-Zn [23], Co-Gd [24], Mn-Ti [25], Ni-Ru, Zn-Ru [26], Ti-Ru [27], and Co-Ti [28,29], were substituted for Fe in Barium hexaferrites. These substitutions were found to cause modifications of the magnetic properties and induce significant changes in several substituted systems.…”

Section: Introductionmentioning

confidence: 99%

“…It was found that small amounts of Co 2+ and Ti 4+ substituting for Fe 3+ in BaFe 12-2x Co x Ti x O 19 , can substantially reduce the coercive field, H C , with only a littlie change in saturation magnetization [28,29,30,31,32,33,34]. On the other hand, with Ru-Ti substitution, the saturation magnetization at room temperature was found to increase up to x = 0.2, and then to decrease for higher x values, while the coercivity decreases monotonically, recording a reduction of about 55% at x = 0.4 [27].…”

Section: Introductionmentioning

confidence: 99%

Magnetic study of M-type doped barium hexaferrite nanocrystalline particles

Alsmadi

Bsoul

Mahmood

et al. 2013

Journal of Applied Physics

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Co-Ti and Ru-Ti substituted barium ferrite nanocrystalline particles BaFe 12-2x ) were prepared by ball milling method, and their magnetic properties and their temperature dependencies were studied. The zero-field-cooled (ZFC) and field-cooled (FC) processes were recorded at low magnetic fields and the ZFC curves displayed a broad peak at a temperature T M . In all samples under investigation, a clear irreversibility between the ZFC and FC curves was observed below room temperature, and this irreversibility disappeared above room temperature. These results were discussed within the framework of random particle assembly model and associated with the magnetic domain wall motion. The resistivity data show some kind of a transition from insulator to perfect insulator around M T . At 2 K, the saturation magnetization slightly decreased and the coercivity dropped dramatically with increasing the Co-Ti concentration x. With Ru-Ti substitution, the 2 saturation magnetization showed small variations, while the coercivity decreased monotonically, recording a reduction of about 73% at x = 0.6. These results were discussed in light of the single ion anisotropy model and the cationic distributions based on previously reported neutron diffraction data for the CoTi substituted system, and the results of our Mössbauer spectroscopy data for the RuTi substituted system.

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“…2 , Ga 3+ etc., [3][4][5] or divalent-tetravalent cation pairs such as Co-Ti, Zn-Ti, Co-Sn, Co-Zr, Ni-Ti, Co-Ir 6-11 and so on. However, because of the sintering temperature of BaM ferrites is higher than 1100…”

Section: Introductionmentioning

confidence: 99%

LTCC processed CoTi substituted M-type barium ferrite composite with BBSZ glass powder additives for microwave device applications

Wang

Liu

et al. 2016

AIP Advances

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Hexagonal magnetoplumbite ferrites typically have sintering temperatures above 1100∘C in order to stabilize a single phase compound, which is much higher than the melting point of silver leading to device fabrication challenges. Application of low temperature co-fired ceramics (LTCC) technologies may prove effective in decreasing the sintering temperature of hexagonal ferrites. Ferrite powders combined with glass frit powder is an effective pathway to lowering the sintering temperature. Here, hexagonal M-type barium ferrite (i.e., Ba(CoTi)1.5Fe9O19) ceramics, combined with BBSZ glass powder as a sintering aid were synthesized. Co and Ti ions where used to substitute for Fe cations in order to modify the magnetic anisotropy field. The density, microstructure, magnetic properties and complex permeability are reported. The BBSZ glass addition was shown to improve the densification and magnetic properties of the barium ferrite. The densification of the BaM ferrite Ba(CoTi)1.5Fe9O19 was further enhanced by the glass additive at low firing temperatures of below 900∘C because of the formation of a liquid phase. Complex permeability of ferrites sintered at 900∘C was also influenced by the BBSZ addition and the resonance frequency was shown to decrease with increased amounts of the glass modifier.

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Magnetic and structural properties of BaFe12−xGaxO19 nanoparticles

Cited by 116 publications

References 29 publications

Hopkinson peak and superparamagnetic effects in BaFe_12-xGa_xO₁₉nanoparticles

Hopkinson peak and superparamagnetic effects in BaFe_12-xGa_xO₁₉nanoparticles

Magnetic study of M-type doped barium hexaferrite nanocrystalline particles

LTCC processed CoTi substituted M-type barium ferrite composite with BBSZ glass powder additives for microwave device applications

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Magnetic and structural properties of BaFe12−xGaxO19 nanoparticles

Cited by 116 publications

References 29 publications

Hopkinson peak and superparamagnetic effects in BaFe12-xGaxO19nanoparticles

Hopkinson peak and superparamagnetic effects in BaFe12-xGaxO19nanoparticles

Magnetic study of M-type doped barium hexaferrite nanocrystalline particles

LTCC processed CoTi substituted M-type barium ferrite composite with BBSZ glass powder additives for microwave device applications

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Hopkinson peak and superparamagnetic effects in BaFe_12-xGa_xO₁₉nanoparticles

Hopkinson peak and superparamagnetic effects in BaFe_12-xGa_xO₁₉nanoparticles