The effect of nano sized SrFe12O19 additions on the magnetic properties of chromium-doped strontium-hexaferrite ceramics

Nourbakhsh, Amir Abbas; Noorbakhsh, Mohsen; Nourbakhsh, Marzieh; Shaygan, Mehrdad; MacKenzie, Kenneth J.D.

doi:10.1007/s10854-011-0303-3

Cited by 30 publications

(11 citation statements)

References 11 publications

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“…M-type hexaferrites, due to its perfect chemical stability, good thermal durability, corrosion resistivity, unique electrical and magnetic properties, has extensive applications in permanent magnet and high density magnetic recording devices, telecommunication, magneto optical and microwave devices [1][2][3][4]. The properties of the ferrites are strongly influenced by their composition and synthesis method [5].…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…Structural and Microstructural Studies Figure 1 shows the XRD patterns of the microwave-sintered Cr 3+ 29 as secondary phase. It was also observed that, with Cr 3+ doping, all the diffraction peaks at 2h = 32°and 35°s hifted towards higher angle, indicating changes in the lattice parameters.…”

Section: Resultsmentioning

confidence: 99%

Structural, Magnetic, and Electrical Properties of Microwave-Sintered Cr3+-Doped Sr Hexaferrites

Praveena

Bououdina

Reddy

et al. 2014

Journal of Elec Materi

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SrCr x Fe 12Àx O 19 (x = 0.0, 0.1, 0.3, 0.5, 0.7, 0.9) hexaferrites were prepared by a microwave-hydrothermal method and subsequently sintered at 950°C for 90 min using the microwave sintering method. The results show that, with increasing Cr 3+ content, the lattice parameters changed anisotropically. The average grain sizes of sintered samples were in the range of 280 nm to 660 nm. The saturation magnetization systematically decreased with increasing Cr 3+ doping, but the coercivity values increased. The electrical resistivity (log q) decreased linearly with increasing temperature up to a certain temperature known as the transition temperature (T c ), and T c decreased with further increase (x > 0.5) of the Cr 3+ content. This decrease in log q and the activation energy (E g ) is due to electron hopping and occupancy of doped ions at different lattice sites. We found that the dielectric constant and dielectric loss for all the samples decreased with the Cr 3+ content. The structural, magnetic, and electrical properties of Cr 3+ -doped SrFe 12 O 19 hexaferrites have thus been investigated.

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“…In previous study, the optimum conditions for the development of the magnetic properties of chromium doped strontium hexaferrite were determined as 1220 • C with 0.3 atom% Cr 3+ content [9]. Before firing these powder mixtures, 1.5 wt% of nano-sized SrFe 12 O 19 prepared, as described before, was added as a sintering aid, and for comparison, some samples were prepared with 1.5 wt% of a commercial calcium silicate borate sintering aid (Type MN112 Taban Magnetic material development Co, Iran).…”

Section: Methodsmentioning

confidence: 99%

“…XRD patterns studies of Cr-doped SrCr x Fe 12-x O 19 samples, where x = 0-0.5, show no change up to x = 0.3, but at x = 0.5 the non-magnetic hematite phase appears [9]. In general, Cr atoms do not occupy tetrahedralsites, ruling out substitution in the 4f 1 siteand confiningthe substitution to 10 of the 12 Fe 3+ ions in SrFe l2 O 19 [17].…”

Section: Development Of Magnetic Properties Of Sr-hexaferrite By Addimentioning

confidence: 97%

“…In this regard, studies are mainly concentrated on transition-metal substitution, for example, Ga 3+ , Ti 4+ , Al 3+ , Zn 2+ , Co 2+ , Cr 3+ , La 3+ , Pr 3+ , Ce 3+ and Zr 2+ -Mn 2+ to substitute Fe +3 ions of hexaferrite [4][5][6][7][8]. In a previous study, the optimum amount of Cr 3+ content in chromium doped strontium hexaferrite was determined at 0.3 atom% Cr 3+ content; higher Cr contents led to the appearance of non-magnetic hematite [9]. In order to achieve highly homogenous particles of strontium and barium hexaferrite, various techniques such as chemical co-precipitation [10], hydrothermal [11], sol-gel [12,13] and glass crystallization [14] have been developed.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Chromium and Aluminium Ion Substitution on Phase Analysis, Microstructure and Magnetic Properties of Sr-Hexaferrite Ceramics and Nanopowders Synthesized by the Auto Combustion Route

Shaygan

Nourbakhsh

Mozafari

et al. 2012

Molecular Crystals and Liquid Crystals

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The chromium and aluminium quantitiesrequired to synthesize nano-sized SrCr x Fe 12-x O 19 and SrAl x Fe 12-x O 19 by the auto combustion route were optimized. XRD analysis showed that the optimum amounts were differed in two cases. A combination of 0.75 wt% of nano-sized SrFe 12 O 19 and 0.75 wt% of the commercial additive, in chromium doped sample from solid state process(Cr 2 O 3 addition), resulted in superior magnetic properties with increased intrinsic coercivity, remanence magnetization and rectangularity ratio.

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The effect of nano sized SrFe12O19 additions on the magnetic properties of chromium-doped strontium-hexaferrite ceramics

Cited by 30 publications

References 11 publications

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

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

Structural, Magnetic, and Electrical Properties of Microwave-Sintered Cr3+-Doped Sr Hexaferrites

The Effect of Chromium and Aluminium Ion Substitution on Phase Analysis, Microstructure and Magnetic Properties of Sr-Hexaferrite Ceramics and Nanopowders Synthesized by the Auto Combustion Route

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