New Dy-Substituted Ba Hexaferrites With High Coercivity

Litsardakis, G.; Manolakis, Ioannis; Στέργιου, Α.; Serletis, C.; Efthimiadis, K.G.

doi:10.1109/tmag.2008.2001541

Cited by 31 publications

(23 citation statements)

References 14 publications

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“…It is concluded that a rare earth element, Eu, acts as a grain growth inhibitor, in agreement with other reports [19][20][21].…”

Section: Structural Propertiessupporting

confidence: 91%

“…The magnetic dilution and spin canting disrupt and weaken the Fe +3 -O-Fe +3 exchange interaction by Fe +2 ions and promote lower M s . We have measured the reflection loss of the samples in the X (8-12 GHz) and Ku (12)(13)(14)(15)(16)(17)(18) bands. According to transmittance line theory, the reflection loss of electromagnetic wave under normal incident wave in the case of a metal-back single layer is given by…”

Section: Magnetic Propertiesmentioning

confidence: 99%

“…In order to improve the magnetic properties of Mtype hexaferrites, there are several substituting Fe +3 and Sr +2 /Ba +2 with some cations such as La +3 [8], Pr +3 [9], Nd +3 [10], Sm +3 [11] and Dy +3 [12]. To vary the magnetic properties of M-type hexaferrites, rare earth elements are very unique because of their characteristic structure of electronic shells.…”

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confidence: 99%

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Structural, Magnetic and Microwave Properties of Eu-doped Barium Hexaferrite Powders

Khademi

Poorbafrani

Kameli

et al. 2011

J Supercond Nov Magn

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Eu-doped M-type barium ferrite powders (Ba 1−x Eu x Fe 12 O 19 ) with x = 0.0, 0.1, 0.2 and 0.25 were prepared by sol-gel method. The synthesized samples are characterized by thermo gravimetric analysis (TG-DTA), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), vibrating sample magnetometer (VSM) and vector network analyzer. All the synthesized samples have the nearly singlemagnetoplumbite phase. The results show that the crystallite size of doped samples is smaller than pure one. The saturation magnetization of doped ferrites decreases by the increase in Eu doping, while the coercivity increases. Maximum coercivity achieved in this study is 6.12 KOe for x = 0.25 sample. The enhancement of coercivity by Eu doping is mainly due to the higher magnetocrystalline anisotropy, which is attributed to the partial change of Fe +3 ion to Fe +2 ion. The maximum reflection loss (RL) of −43 dB at frequency range of 12-18 GHz for the x = 0.1 sample was obtained. The increase in reflection loss at higher frequency suggests that the Eu-doped sample can be used for the application in microwave devices.

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“…It is concluded that a rare earth element, Eu, acts as a grain growth inhibitor, in agreement with other reports [19][20][21].…”

Section: Structural Propertiessupporting

confidence: 91%

Section: Magnetic Propertiesmentioning

confidence: 99%

mentioning

confidence: 99%

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Structural, Magnetic and Microwave Properties of Eu-doped Barium Hexaferrite Powders

Khademi

Poorbafrani

Kameli

et al. 2011

J Supercond Nov Magn

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“…24) Among these methods, the ceramic process is typically used to prepare the magnetic oxides because of its simplicity, highly productive, well controllable grain size and cheaper than other methods. 25) In this work, series of hexagonal ferrites, Sr 0.…”

Section: )19)mentioning

confidence: 99%

Influence of Cr doping on the microstructural and magnetic properties of the Sr0.35Ca0.30La0.35Fe12.00−xCrxO19 hexagonal ferrites

Yang

Wang

Shao

et al. 2017

J. Ceram. Soc. Japan

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Cr-doped hexagonal ferrites, with chemical composion Sr 0.35 Ca 0.30 La 0.35 Fe 12.00¹x Cr x O 19 (where 0.00¯x¯1.05), were synthesized using the traditional ceramic route. An X-ray diffractometer (XRD) and a vibrating sample magnetometer were used to characterize the phase composition and magnetic properties of the magnetic powders, respectively. The XRD data show that when the Cr content (x)¯0.60, non-magnetic phase, ¡-Fe 2 O 3 , is obviously observed. When the Cr content (x) ² 0.60, the diffraction patterns demonstate that the magnetic powders show the magnetoplumite structure, and only a small trace of ¡-Fe 2 O 3 is observed. The saturation magnetization linearly decreases with the increase of Cr content (x) from 0.00 to 1.05, while the remanent magnetization first increases with Cr content (x) from 0.00 to 0.45, and then keeps constant with Cr content (x) form 0.45 to 0.75, and decreases when Cr content (x) ² 0.75. The coercivity initially enhances significantly with the increasing of Cr content (x) until it reaches to the maximum value of 3925 Oe at Cr content (x) = 0.60, and then decreases slowly when Cr content (x) ² 0.60.

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“…Hence, several research works have been carried out to improve the their magnetic properties through the partial substitution of Sr 2+ or Ba 2+ ions by rare earth elements such as Nd 3+ , Sm 3+ , La 3+ , Dy 3+ and Gd 3+ , or Fe 3+ ions by transition metal elements such as Co 2+ , Cu 2+ , Zn 2+ , Al 3+ , Cr 3+ and Bi 3+ ions. [12][13][14][15][16][17][18][19][20][21][22][23] Nd 3+ substitution on the magnetic properties of M-type strontium hexaferrites has been studied. 12 Liu et al have indicated that the for the M-type strontium ferrites, the magnetic properties, especially the coercive field, were remarkably modified due to the substitution of Fe 3+ ions by Co 2+ ions.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Al3+-Co2+ co-substituted M-type SrCaNd hexaferrites and their controlled magnetic properties

et al. 2018

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Al3+-Co2+ co-substituted M-type SrCaNd hexaferrites with cation compositions Sr0.5Ca0.2Nd0.3Fe12.0-x(Al0.5Co0.5)xO19 were synthesized using the traditional ceramic process by varying AlCo content (x) (0.0 ≤ x ≤ 0.5). The microstructures, morphologies and ferromagnetic properties of the samples were investigated as a function of AlCo content (x) by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Fourier transformer infrared (FT-IR) spectroscopy and Hysteresis graph meter. The X-ray diffraction patterns show that the hexaferrites with AlCo content (x) of 0.0 ≤ x ≤ 0.2) exhibited M-type phase and α-Fe2O3 as impurity phase, while the hexaferrites with AlCo content (x) ≥ 0.3 exhibited the single M-type phase. XRD, along with FT-IR analysis confirmed the formation of M-type hexaferrites and the successful substitution of Al3+ and Co2+ ions in the hexaferrite lattice. The results of FE-SEM images proposed that all the particles with regular hexagonal platelet-like shape were homogeneous dispersed. The remanence (Br) first increased with AlCo content (x) from 0.0 to 0.3, and then decreased when AlCo content (x) ≥ 0.3. The intrinsic coercivity (Hcj) and magnetic induction coercivity (Hcb) first increased with AlCo content (x) from 0.0 to 0.2, and then decreased with AlCo content (x) from 0.2 to 0.3, and increased when AlCo content (x) ≥ 0.3. Maximum energy product [(BH)max] first increased with AlCo content (x) from 0.0 to 0.2, and then decreased at AlCo content (x) ≥ 0.2. Squareness ratio (Hk/Hcj) decreased with increasing AlCo content (x) from 0.0 to 0.5.

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New Dy-Substituted Ba Hexaferrites With High Coercivity

Cited by 31 publications

References 14 publications

Structural, Magnetic and Microwave Properties of Eu-doped Barium Hexaferrite Powders

Structural, Magnetic and Microwave Properties of Eu-doped Barium Hexaferrite Powders

Influence of Cr doping on the microstructural and magnetic properties of the Sr<sub>0.35</sub>Ca<sub>0.30</sub>La<sub>0.35</sub>Fe<sub>12.00−</sub><i><sub>x</sub></i>Cr<i><sub>x</sub></i>O<sub>19</sub> hexagonal ferrites

Preparation of Al3+-Co2+ co-substituted M-type SrCaNd hexaferrites and their controlled magnetic properties

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New Dy-Substituted Ba Hexaferrites With High Coercivity

Cited by 31 publications

References 14 publications

Structural, Magnetic and Microwave Properties of Eu-doped Barium Hexaferrite Powders

Structural, Magnetic and Microwave Properties of Eu-doped Barium Hexaferrite Powders

Influence of Cr doping on the microstructural and magnetic properties of the Sr<sub>0.35</sub>Ca<sub>0.30</sub>La<sub>0.35</sub>Fe<sub>12.00&minus;</sub><i><sub>x</sub></i>Cr<i><sub>x</sub></i>O<sub>19</sub> hexagonal ferrites

Preparation of Al3+-Co2+ co-substituted M-type SrCaNd hexaferrites and their controlled magnetic properties

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Resources

About

Influence of Cr doping on the microstructural and magnetic properties of the Sr<sub>0.35</sub>Ca<sub>0.30</sub>La<sub>0.35</sub>Fe<sub>12.00−</sub><i><sub>x</sub></i>Cr<i><sub>x</sub></i>O<sub>19</sub> hexagonal ferrites