W-type hexaferrite nanoparticles: A consideration for microwave attenuation at wide frequency band of 0.5–10GHz

Iqbal, Muhammad Javed; Khan, Rafaqat Ali; Takeda, Shigeru; Mizukami, Shigemi; Miyazaki, T.

doi:10.1016/j.jallcom.2011.04.103

Cited by 41 publications

(6 citation statements)

References 31 publications

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“…[1][2][3][4][5][6][7][8]. From the viewpoint of microwave devices, ferrites are used into an alternating magnetic field because of their high electrical resistivity, low eddy current loss and excellent magnetic property in high frequency as compared with metal magnetic materials.…”

Section: Introductionmentioning

confidence: 99%

Structural, dielectric and magnetic properties of Cr–Zn doped strontium hexa-ferrites for high frequency applications

Asghar

Anis-ur-Rehman

2012

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Structural, dielectric and magnetic properties of Cr–Zn doped strontium hexa-ferrites for high frequency applications

Asghar

Anis-ur-Rehman

2012

Journal of Alloys and Compounds

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“…Thus, the magnetic properties of W-type hexaferrites can be affected by the occupation of their sites by different cations [12,14,16]. The magnetic moments of Fe 3+ and Al 3+ ions are 5.0 μB and about 0.0 μB, respectively [16,29]. As the Al con- As can be seen from Figure 8, the value of M s gradually decreased from 72.779 emu/g at x = 0.00 to 61.882 emu/g at x = 1.25.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

“…Thus, the magnetic properties of W-type hexaferrites can be affected by the occupation of their sites by different cations [12,14,16]. The magnetic moments of Fe 3+ and Al 3+ ions are 5.0 µ B and about 0.0 µ B , respectively [16,29]. As the Al content (x) increased from 0.00 to 1.25, M s decreased, which is attributed to the following factor: Albanese et al studied the Al-substituted Zn 2 -W hexaferrites and Al-substituted M-type Ba hexaferrites and found that Al 3+ ions preferentially enter into the octahedral sites 2 a and 12 k [30,31].…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Two-Step Calcination-Method-Derived Al-Substituted W-Type SrYb Hexaferrites: Their Microstructural, Spectral, and Magnetic Properties

Yang

2022

Magnetochemistry

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W-type hexaferrites were discovered in the 1950s and are of interest for their potential applications. In this context, many researchers have conducted studies on the partial substitution of Fe sites in order to modify their electric and magnetic properties. In this study, W-type SrYb hexaferrites using Al3+ as substitutes for Fe3+ sites with the nominal composition Sr0.85Yb0.15Zn1.5Co0.5AlxFe16-xO27 (0.00 ≤ x ≤ 1.25) were successfully synthesized via the two-step calcination method. The microstructures, spectral bands of characteristic functional groups, morphologies, and magnetic parameters of the prepared samples were characterized using XRD, FTIR, SEM, EDX, and VSM. The XRD results showed that, compared with the standard patterns for the W-type hexaferrite, the W-type SrYb hexaferrites with the Al content (x) of 0.00 ≤ x ≤ 1.25 were a single-W-type hexaferrite phase. SEM images showed the flakes and hexagonal grains of W-type hexaferrites with various Al content (x). The saturation magnetization (Ms) and magneton number (nb) decreased with Al content (x) from 0.00 to 1.25. The remanent magnetization (Mr) and coercivity (Hc) decreased with Al content (x) from 0.00 to 0.25. Additionally, when the Al content (x) ≥ 0.25, Mr and Hc increased with the increase in the Al content (x). The magnetic anisotropy field (Ha) and first anisotropy constant (K1) increased with the Al content (x) increasing from 0.00 to 1.25. Al-substituted W-type SrYb hexaferrites with soft magnetic behavior, high Ms, and lower Hc may be used as microwave-absorbing materials.

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“…In fact, the Co 2+ ions have low magnetic moment (3 μ B ) compared to Mn 2+ (5 μ B ), but it has a high magnetic moment compared to Ca 2+ and Zn 2+ (0 μ B ) cations [19]. It is reported that the Co 2+ cations prefer occupation of octahedral 4f VI and 6g sites [21,22], which have downward and upward spin directions, respectively [23]. It has also been reported that magnetic metal cations prefer to occupy the octahedral sites of spinel block, while non-magnetic metal cations prefer to occupy the tetrahedral sites of spinel blocks [24].…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Effects of Divalent Ion Substitution on the Microstructure and Magnetic Properties of SrCo 2−x (MnZnCa) x/3Fe 1 6 O 2 7 Nanoparticles

Ghasemi

2016

J Supercond Nov Magn

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W-type hexaferrite nanoparticles with a composition of SrCo 2−x (MnZnCa) x/3 Fe 16 O 27 (x = 0-0.5) were synthesized by a chemical co-precipitation method. The effect of substitution of Mn, Zn, and Ca cations on the structural and magnetic properties of nanoparticles was characterized by X-ray diffraction (XRD), Fourier transformed infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), and vibrating sample magnetometer (VSM). The XRD patterns confirmed the existence of hexagonal W-type single phase ferrite. According to the SEM micrographs, it was found that the particle size lies in the range of 40-60 nm, with an irregular configuration. The elemental composition estimated from the EDX analysis was in good agreement with the nominal composition. Hysteresis loops for all samples were measured at a room temperature up to a maximum applied field of 10 kOe. The results revealed that with an increase in substitutional cation contents, the values of saturation magnetization and coercivity decreased from 78.4 to 70.8 emu/g and the values of coercivity also decreases from 1350 to 940 Oe. Correlation between structural and magnetic analyses was also earned out.

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W-type hexaferrite nanoparticles: A consideration for microwave attenuation at wide frequency band of 0.5–10GHz

Cited by 41 publications

References 31 publications

Structural, dielectric and magnetic properties of Cr–Zn doped strontium hexa-ferrites for high frequency applications

Structural, dielectric and magnetic properties of Cr–Zn doped strontium hexa-ferrites for high frequency applications

Two-Step Calcination-Method-Derived Al-Substituted W-Type SrYb Hexaferrites: Their Microstructural, Spectral, and Magnetic Properties

Effects of Divalent Ion Substitution on the Microstructure and Magnetic Properties of SrCo 2−x (MnZnCa) x/3Fe 1 6 O 2 7 Nanoparticles

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