Elucidation of phase evolution, microstructural, Mössbauer and magnetic properties of Co2+Al3+ doped M-type Ba Sr hexaferrites synthesized by a ceramic method

Singh, Jasbir; Singh, Charanjeet; Kaur, Dalveer; Zaki, H.M.; Abdel-Latif, I.A.; Narang, Sukhleen Bindra; Jotania, Rajshree B.; Mishra, Sanjay R.; Joshi, R. V.; Dhruv, Preksha N.; Ghimire, Madhav; Shirsath, Sagar E.; Meena, Sher Singh

doi:10.1016/j.jallcom.2016.10.237

Cited by 99 publications

(16 citation statements)

References 39 publications

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“…While H cj and H cb are increased with further increasing AlCo content (x) from 0.3 to 0.5. The changing trend of H cj and H cb is not in agreement with that of the coercivity (H c ) reported by Singh et al 23 This indicates that Al-Co substitution can be used to tune the coercivity of M-type SrCaNd hexaferrites. The coercivity (H cj ) for the M-type hexaferrites can be described by the following relation: 49…”

Section: -contrasting

confidence: 64%

“…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%

“…20 Singh et al prepared 19 (0.0 ≤ x ≤ 1.0) by the ceramic method and found that the substitution of Co 2+ and Al 3+ ions resulted in reduction of saturation magnetization (M s ) and coercivity (H c ) by 38.40% and 76.76% from 0.0 to 1.0, respectively. 23 Several studies have been done to improve the magnetic properties of M-type hexaferrites by simultaneous substitution of Sr 2+ or Ba 2+ ions by rare earth elements and Fe 3+ ions by transition metal elements. [24][25][26][27] It is reported that the combined substitution of Nd-Co substituted strontium hexaferrites with the composition of Sr 1-x Nd x Fe 12-x Co x O 19 (x = 0.00-0.50) synthesized by the sol-gel auto-combustion method with further heat treatment and found that the coercivity (H c ) increased 11% with Nd-Co substitution content (x) = 3, reaching to a maximum of 5480 Oe, while the saturation magnetization (M s ) was reduced 6% to 91 emu/g.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: -contrasting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…The third class of ferrites are garnets of form A 3 B 5 O 12 [20][21][22][23][24][25][26][27][28][29]. The fourth class, termed as hexaferrites, may be divided into five main groups: M-type (AB 12 [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49]. The preparation of these materials and their characterization are very rich topics because of the wide range of applications and the cheap materials obtained.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Shielding Effectiveness of M-Type Ba-Co-Ti Hexagonal Ferrite and Composite Materials in Microwave X-Band Systems

Singh¹,

Narang²,

Abdel-Latif³

2021

Composite Materials

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Ferrites are a wide class of materials that are still a very rich field of scientific interest and under the scope of recent research. The polycrystalline Co 2+-T i 4+ substituted Ba hexagonal ferrite has been synthesized by the standard ceramic method. The vector network analyzer has been incorporated to measure different microwave parameters at X-band (8.2-12.4 GHz) frequencies. The microwave shielding effectiveness is evaluated by S-parameters for near field and AC conductivity as well as skin depth for far field. The doping of Co 2+ and Ti 4+ ions causes absorption in composite x = 0.5 to exhibit good shielding effectiveness and it exhibits large 20-dB bandwidth of 4.70 GHz in the near field and 3.60 GHz for far field respectively. The AC conductivity increases with frequency in composites x = 0.1, 0.3, and 0.5 and skin depth decreases with frequency in all composites. The shielding effectiveness, AC conductivity, and skin depth are correlated to each other.

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“…In addition, co-doped Tm-Tb, Eu-Nd, Sm-Co Ba-hexaferrites have also been investigated and have been shown that co-doping of the rare-earth ions provides hexaferrites with a rise in the magnetization and/or coercivity [24][25][26][27]. Among other magnetic properties, some attempts have also been made to improve the maximum energy product, (BH)max for Srhexaferrites and Ba-hexaferrites using La-Sm [28,29].Researchers have different manufacturing methods to produce hexaferrites such as traditional ceramic methods [30][31][32][33][34] or several chemical methods [35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Effect of Rare-Earth Co-Doping on the Microstructural and Magnetic Properties of BaFe₁₂O₁₉

Güler

Ertuǧ

Işıkcı

et al. 2020

Advances in Materials Science

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Ba0.85(La,Y)0.15Fe12O19 hexaferrite magnets were produced using the powder metallurgy method. The phase analysis of the ferrite magnets was carried out by X-ray diffraction (XRD) technique. A single hexaferrite phase was present in both samples as revealed by XRD patterns. The microstructural evolution in the hexaferrite samples was examined using Scanning Electron Microscopy (SEM) equipped with Energy Dispersive X-Ray Spectroscopy (EDS). The grain morphology altered with the sintering temperature. Room temperature ferrimagnetic hysteresis curves were obtained by Vibrating Sample Magnetometer (VSM). The crystallite size and the lattice parameters (a,c) were also calculated after sintering at 1150ºC and 1250ºC. Saturation magnetizations, Ms were determined to be 48.60 emu/g and 52.95 emu/g for the samples sintered at 1150ºC and 1250ºC, respectively whereas the remanent magnetizations, Mr were 29.26 emu/g and 31.17 emu/g. The coercivity, Hc decreased from 3.95 kOe to the value of 2.44 kOe with the sintering temperature due to the increase of the crystallite size. The squareness ratios (Mr/Ms) of the ferrimagnetic samples were different because the uniaxial anisotropies altered after sintering at 1150ºC and 1250ºC. The maximum energy product, (BH)max dropped from 35.81 kJ/m3 to 27.38 kJ/m3 when the sintering temperature increased. This result can be attributed to a combination of higher magnetization and the lower coercivity.

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Elucidation of phase evolution, microstructural, Mössbauer and magnetic properties of Co2+Al3+ doped M-type Ba Sr hexaferrites synthesized by a ceramic method

Cited by 99 publications

References 39 publications

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

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

Investigation of Shielding Effectiveness of M-Type Ba-Co-Ti Hexagonal Ferrite and Composite Materials in Microwave X-Band Systems

Effect of Rare-Earth Co-Doping on the Microstructural and Magnetic Properties of BaFe₁₂O₁₉

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Elucidation of phase evolution, microstructural, Mössbauer and magnetic properties of Co2+Al3+ doped M-type Ba Sr hexaferrites synthesized by a ceramic method

Cited by 99 publications

References 39 publications

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

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

Investigation of Shielding Effectiveness of M-Type Ba-Co-Ti Hexagonal Ferrite and Composite Materials in Microwave X-Band Systems

Effect of Rare-Earth Co-Doping on the Microstructural and Magnetic Properties of BaFe12O19

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Effect of Rare-Earth Co-Doping on the Microstructural and Magnetic Properties of BaFe₁₂O₁₉