Controlling the composition and magnetic properties of strontium hexaferrite synthesized by co-precipitation method

Hessien, M.M.; Rashad, M.M.; El-Barawy, K.

doi:10.1016/j.jmmm.2007.06.009

Cited by 223 publications

(82 citation statements)

References 14 publications

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“…In x' mol% at room temperature addition, the change in morphology and particle size may also affect the magnetic properties [18]. However, from the economical point of view, Ni and Zr bearing oxides are cheaper than rare earth oxides or salts.…”

Section: Resultsmentioning

confidence: 99%

Preparation and magnetic properties of Ni–Zr doped barium strontium hexaferrite

Kanagesan

Jesurani

Ramachandran

et al. 2011

J Mater Sci: Mater Electron

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M-type Hexaferrites B 0.5 Sr 0.5 Fe 12-2x Ni x Zr x O 19 were synthesized and investigated. The XRD patterns show single phase of the magnetoplumbite barium strontium ferrite and no other phases were present. The samples exhibit well defined crystallization; all of them are hexagonal platelet grains. As the substitution level increased from x = 0.2 to 0.8 mol%, the grains are agglomerated and the average diameter increased. This suggests that Ni-Zr substitution increases the grain size, as observed in the FE-SEM micrographs. The results of magnetic measurement revealed that M s of barium strontium hexaferrite increased when the value of x increased from 0 to 0.4 mol% and then decreased with the increasing Ni-Zr content. The H c decreases remarkably with increasing Ni and Zr ions content. Hard magnetic material is converted into soft magnetic material when the substitution level is increased from 0.2 to 0.8 mol%. In particular, Ba 0.5 Sr 0.5 Fe 12-2x Ni x Zr x O 19 with x = 0.2, 0.4, 0.6, 0.8 mol% has suitable magnetic characteristics with particle size small enough for highdensity magnetic recording applications.

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Section: Resultsmentioning

confidence: 99%

Preparation and magnetic properties of Ni–Zr doped barium strontium hexaferrite

Kanagesan

Jesurani

Ramachandran

et al. 2011

J Mater Sci: Mater Electron

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“…In our work, the maximum value of coercivity is received in samples calcined at 1050 • C. The enhancement of coercivity at high calcination temperature could be attributed to two aspects: the enhancement of anisotropy field for the substitution of Fe 3+ ions by Co 2+ ions and the formation of grains with plate-like shape. The M-strontium hexaferrites with grains in plate-like shape have higher morphology anisotropy [8] and are beneficial to coercivity [22]. To modify the magnetic properties of strontium ferrites, the co-substitution of Nd 3+ and Co 2+ ions was applied to replace the Sr 2+ and Fe 3+ ions, respectively.…”

Section: Resultsmentioning

confidence: 99%

Preparation and Magnetic Properties of Nd–Co-Substituted M-Type Strontium Ferrite by Microwave-Assisted Synthesis Method

Wang

et al. 2015

J Supercond Nov Magn

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M-strontium hexaferrites (Sr 1−x Nd x Fe y Co 1−y O 19 ) with the substitution of Co 2+ and Nd 3+ were prepared by the microwave-assisted solid-phase reaction process. Mstrontium hexaferrite with magnetoplumbite structure can be formed at 950 • C for 90 min by applying microwaveassisted calcination. For Co 2+ -substituted M-strontium ferrites, the saturation magnetization (σ s ) and remanent magnetization (σ r ) tend to decrease with the increasing calcination temperature, accompanying by the improvement of coercivity for the enhancement of morphology anisotropy. For Nd-Co-co-substituted strontium ferrites, the appearance of α-Fe 2 O 3 phase and the conversion of Fe 3+ (5 μB) into Fe 2+ (4 μB) decrease the net magnetic moment, resulting in the dilution of the σ s and σ r . The coercivity of NdCo-co-substituted strontium ferrite increases slightly for the improvement of magnetocrystalline anisotropy, which could be attributed to the enhancement of anisotropy field for the substitution of Fe 3+ ions by Co 2+ ions and the formation of grains with plate-like shape.

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“…In addition, the change in morphology and grain size may also affect the magnetic properties [13]. However, from the economical point of view, Ni and Co bearing oxides are cheaper than rare earth oxides or salts.…”

Section: Resultsmentioning

confidence: 99%

Magnetic properties of Ni–Co doped barium strontium hexaferrite

Kanagesan

Jesurani

Ramachandran

et al. 2012

J Mater Sci: Mater Electron

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A series of Ni-Co substituted barium strontium hexaferrite materials, Ba 0.5 Sr 0.5 Ni x Co x Fe 12-2x O 19 (x = 0.0, 0.2, 0.4, 0.6, 0.8 mol%) was synthesized by the sol-gel method. X-ray diffraction analysis has shown that the NiCo substitutions maintain in a single hexagonal magnetoplumbite phase. The room temperature magnetic properties and the cation site preferences of Ni-Co substituted ferrite were investigated by VSM. Substitutions led to decrease in coercivity while saturation magnetization remains the almost same. It indicates that the saturation magnetization (52.81-59.8 Am 2 /kg) and coercivity (69.83-804.97 Oe) of barium strontium hexaferrite samples can be varied over a very wide range by an appropriate amount of Ni-Co doping contents.

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Controlling the composition and magnetic properties of strontium hexaferrite synthesized by co-precipitation method

Cited by 223 publications

References 14 publications

Preparation and magnetic properties of Ni–Zr doped barium strontium hexaferrite

Preparation and magnetic properties of Ni–Zr doped barium strontium hexaferrite

Preparation and Magnetic Properties of Nd–Co-Substituted M-Type Strontium Ferrite by Microwave-Assisted Synthesis Method

Magnetic properties of Ni–Co doped barium strontium hexaferrite

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