Magnetic and microwave absorbing properties of low-temperature sintered BaZrxFe(12−x)O19

Deng, Li; Zhao, Yang; Xie, Zhiqiang; Liu, Zuohua; Tao, Changyuan; Deng, Rongrui

doi:10.1039/c8ra08783k

Cited by 25 publications

(8 citation statements)

References 37 publications

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“…Doping of BFO nanoparticles (NPs) with different ions causes an increase or decrease of the spontaneous magnetization M s and the coercive field H c . [ 12–17 ] For example, M s decreases by doping with

{Al}^{3 +}

and

{Zr}^{4 +}

ions, [ 12,14,18 ] whereas it increases by doping with

{Ni}^{2 +}, C {normalo}^{2 +}

, or

{Cu}^{2 +}

ions. [ 13,17,19 ] Until now, the reason for such a different behavior is not clarified theoretically.…”

Section: Introductionmentioning

confidence: 99%

“…The dielectric properties of Zr‐doped BFO NPs were studied by Deng et al [ 14 ] They found an increase of

ϵ'

with increasing Zr dopants due to the replacement of

{Fe}^{3 +}

{Zr}^{4 +}

, and of the

{Fe}^{3 +}

ions by

{Fe}^{2 +}

ions to keep charge neutrality. The dielectric properties of BFO for different doping ions such as Al, La, Ni, Ti, and Dy have been reported in several studies.…”

Section: Introductionmentioning

confidence: 99%

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Multiferroic Properties of Pure, Transition‐Metal and Rare‐Earth–Doped BaFe₁₂O₁₉ Nanoparticles

Apostolova

Apostolov

Trimper

et al. 2021

Physica Status Solidi (b)

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Different properties of pure and Ni, Zr, and Sm‐doped BaFe12O19—bulk and nanoparticles—are investigated using a microscopic model and the Green's function technique. The magnetization Mnormals increases whereas the coercive field Hnormalc decreases with increasing particle size. The doping leads to a decrease of Ms and the bandgap energy Eg with increasing Zr concentration x due to tensile strain and to an increase of Ms and Eg after Ni doping due to compressive strain as well as due to size effects. The behavior of the spontaneous polarization Ps and the real part ϵ′ of the dielectric constant is opposite. The ϵ′ of a pure BaFe12normalO19 nanoparticle decreases with increasing magnetic field h. The effects of Sm substitution at Ba or Fe sites on ϵ′ and Ms are also studied.

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{Al}^{3 +}

and

{Zr}^{4 +}

ions, [ 12,14,18 ] whereas it increases by doping with

{Ni}^{2 +}, C {normalo}^{2 +}

, or

{Cu}^{2 +}

ions. [ 13,17,19 ] Until now, the reason for such a different behavior is not clarified theoretically.…”

Section: Introductionmentioning

confidence: 99%

“…The dielectric properties of Zr‐doped BFO NPs were studied by Deng et al [ 14 ] They found an increase of

ϵ'

with increasing Zr dopants due to the replacement of

{Fe}^{3 +}

{Zr}^{4 +}

, and of the

{Fe}^{3 +}

ions by

{Fe}^{2 +}

ions to keep charge neutrality. The dielectric properties of BFO for different doping ions such as Al, La, Ni, Ti, and Dy have been reported in several studies.…”

Section: Introductionmentioning

confidence: 99%

Multiferroic Properties of Pure, Transition‐Metal and Rare‐Earth–Doped BaFe₁₂O₁₉ Nanoparticles

Apostolova

Apostolov

Trimper

et al. 2021

Physica Status Solidi (b)

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“…The problem faced in a ferrite-based magnetic material that will be the object of this study is the magnetocrystalline anisotropy constant of this compound has relatively high value of ~ 330 kJ/m 3 . This value is very high and causes the material has relatively large coercivity about ~ 1500 kA.m -1 which is needed as a permanent magnet [11][12][13][14][15]. However, as an absorber material of electromagnetic waves (microwave absorber) must have a coercivity value as low as possible so that the magnetic loss is low, but should still have a high value of the total magnetization.…”

Section: Introductionmentioning

confidence: 99%

“…However, as an absorber material of electromagnetic waves (microwave absorber) must have a coercivity value as low as possible so that the magnetic loss is low, but should still have a high value of the total magnetization. According to some literature it is mentioned that magnetic materials with the best absorption of microwaves, have a coercivity field of less than 1 kOe [1,3,4,[6][7][8][9][10][11][12]. As for the other properties necessary for electromagnetic wave absorbing material is a high permeability magnetic and resistive.…”

Section: Introductionmentioning

confidence: 99%

EFFECT OF Mn AND Ti ADDITION ON THE CRYSTALLOGRAPHIC STRUCTURE AND MAGNETIC PROPERTIES OF SrFe12O19

et al. 2020

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The synthesis and characterization of composition SrFe12-(x+y)MnxTiyO19 (x = y and x ≠ y) compound by using solid state reaction have been performed. The raw materials were SrCO3, Fe2O3, MnCO3, and TiO2. The mixed powder was compacted at 5000 psi into pellets and sintered at 1050°C in the air at atmosphere pressure for 15 hours and furnace cooling. The refinement results of x-ray diffraction pattern show that the doping composition (x = y) was a single phase while the doping composition (x ≠ y) was multi phase. We concluded that effect of substitution upon magnetic properties revealed that total magnetization, remanence and coercivity changed with substitution due to preferential site occupancy of substituted Mn2+ and Ti4+ ions. The coercivity decreases with increase in Mn and Ti concentration. This effect is related with Fe3+ magnetic moment changes after they have already substituted Mn2+ and Ti4+ ions. Since the coercivity and total magnetization may be controlled by substitution while maintaining resistive properties, making this material useful for microwave absorber.

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“…Li et al 20 studied the partial cationic inversion-induced magnetic hardening of nickel ferrite nanowires. Deng et al 21 found that introduction of Zr 4+ ion in BaFe 12 O 19 to substitute Fe 3+ ion sharply decreased the coercivity while the saturation magnetization remained constant. Chen et al 22 reported that strontium ferrites/graphene (SrFe 12 O 19 /G) composites exhibited better absorption properties than pristine SrFe 12 O 19 particles.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis and competitive growth of flake-like M-type strontium hexaferrite

et al. 2019

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In this paper, single flake-like strontium hexaferrite was directly synthesized via a modified hydrothermal approach without high-temperature annealing. To determine the main factors governing the formation of the hexaferrite phase and impurity a-Fe 2 O 3 , effects of alkali environment and concentrations of metal ions on phase composition, grain growth, and magnetic properties were systematically analyzed. Results from XRD, FESEM and FT-IR analyses indicated that initial alkali concentration was the key factor influencing the phase composition of particles. Suitable initial alkali environment can enhance the nucleation and growth of ferrite, and inhibit the formation of by-product a-Fe 2 O 3 at the same time. It was also found that the increase in initial concentration of strontium ions could improve the nucleation of hexaferrite and reduce the grain size, and consequently, change the magnetic performance of hexagonal particles. When the molar ratios of ferric ions to strontium ions were constant, the average grain size did not change significantly with the initial concentration of iron ions, which could be attributed to high levels of strontium ions and hydroxyl ions in the reaction system. The abovementioned results indicate that the optimized hydrothermal conditions are beneficial for the formation of a single phase and for controlling the particle size and magnetic properties of M-type hexaferrite.

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Magnetic and microwave absorbing properties of low-temperature sintered BaZr_xFe_(12−x)O₁₉

Abstract: BaZrxFe(12−x)O19 ferrites synthesized at low temperature have high saturation magnetization, a wide coercivity range and excellent microwave absorbing properties.

Cited by 25 publications

References 37 publications

Multiferroic Properties of Pure, Transition‐Metal and Rare‐Earth–Doped BaFe₁₂O₁₉ Nanoparticles

Multiferroic Properties of Pure, Transition‐Metal and Rare‐Earth–Doped BaFe₁₂O₁₉ Nanoparticles

EFFECT OF Mn AND Ti ADDITION ON THE CRYSTALLOGRAPHIC STRUCTURE AND MAGNETIC PROPERTIES OF SrFe12O19

Hydrothermal synthesis and competitive growth of flake-like M-type strontium hexaferrite

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Magnetic and microwave absorbing properties of low-temperature sintered BaZrxFe(12−x)O19

Abstract: BaZrxFe(12−x)O19 ferrites synthesized at low temperature have high saturation magnetization, a wide coercivity range and excellent microwave absorbing properties.

Cited by 25 publications

References 37 publications

Multiferroic Properties of Pure, Transition‐Metal and Rare‐Earth–Doped BaFe12O19 Nanoparticles

Multiferroic Properties of Pure, Transition‐Metal and Rare‐Earth–Doped BaFe12O19 Nanoparticles

EFFECT OF Mn AND Ti ADDITION ON THE CRYSTALLOGRAPHIC STRUCTURE AND MAGNETIC PROPERTIES OF SrFe12O19

Hydrothermal synthesis and competitive growth of flake-like M-type strontium hexaferrite

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Magnetic and microwave absorbing properties of low-temperature sintered BaZr_xFe_(12−x)O₁₉

Multiferroic Properties of Pure, Transition‐Metal and Rare‐Earth–Doped BaFe₁₂O₁₉ Nanoparticles

Multiferroic Properties of Pure, Transition‐Metal and Rare‐Earth–Doped BaFe₁₂O₁₉ Nanoparticles