Key step in synthesis of ultrafine BaFe12O19 by sol-gel technique

Wang, Zhong; Ding, Weiping; Zhang, Ning; Hong, Jianming; Yan, Qijie; Du, Youwei

doi:10.1016/s0304-8853(96)00664-6

Cited by 223 publications

(126 citation statements)

References 26 publications

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“…Aerosol pyrolysis [10], chemical co-precipitation [11], hydrothermal reaction [12], sol-gel [13], oxidation technique using nitric acid (HNO 3 ) [14] and self-propagating high temperature synthesis [15,16] are some examples. Among these methods, the facile lower temperature chemical methods have potential advantages of relatively low cost, as well as avoiding the use of complicated processes and special instruments.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, single phase samples were obtained when it is around 1:11 in the sol-gel technique [19], when ball milling was used optimum ratio is 1:12 [20], 1:10 in the coprecipitation route [11], and it is 1:4 in the hydrothermal method [21]. Pre-heating between 400℃ and 500℃ for several hours was reported as a key factor to prevent formation of α-Fe 2 O 3 phase in the sol-gel technique [22]. In this way, samples with coercive field of 5950 Oe and having magnetization of 70 emu/g have been synthesized [23].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Condensation on the Morphology and Magnetic Properties of Modified Barium Hexaferrite (BaFe12O19)

et al. 2011

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Abstract:We present a comparison for the effect of condensation on the morphology and magnetic properties of oleic acid modified BaFe12O19 nanoparticles. Two different samples of BaFe12O19 nanoparticles were synthesized by dehydration (Z1) and rotary evaporation (Z2) method, respectively. Oleic acid was used as the surface modification agent to observe the morphological and magnetic changes. The nanoparticles were analyzed by XRD, FTIR, TGA, SEM, and VSM techniques for structural and physicochemical characteristics. Crystallographic analysis reveals the phase as hexaferrite and the average crystallite size of Z1 and Z2 is 21±3 nm and 17±2 nm, respectively. Rotary evaporator accelerates the condensation process in viscous gel (Z2). Due to the use of rotary evaporator, the coating with oleic acid for Z2 product has been accomplished very well, as compared with Z1. As a result, saturation magnetization of Z2 sample is much lower than that of Z1 sample.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effect of Condensation on the Morphology and Magnetic Properties of Modified Barium Hexaferrite (BaFe12O19)

et al. 2011

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“…In order to obtain ultrafine particles for use in high density magnetic recording media, it is essential to find the best synthesis conditions. The sol-gel, the chemical coprecipitation, hydrothermal synthesis, micro emulsion and reverse micelle [11][12][13][14][15][16][17]. In the present work, important modification of morphology, dielectric and magnetic properties of Y-type hexaferrites is achieved by doping with a relatively small amount of Y 2 O 3 .…”

Section: Introductionmentioning

confidence: 86%

HYSTERESIS AND ELECTRIC MODULUS ANALYSIS OF Y³⁺ DOPED MnNi-Y-TYPE HEXAGONAL FERRITE

Irfan¹

2016

Ceramics - Silikaty

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“…To date, many methods have been used to prepare the M-type hexaferrites, such as sol-gel technique, sol-gel auto-combustion method, hydrothermal method, standard ceramic process, co-precipitation method, and reverse micelle technique. [6][7][8][9][10][11] The standard ceramic process was used to synthesize the M-type hexaferrites due to its many advantages such as simplicity, high productive and well controllable grain size as compared with other methods. Furthermore, the intrinsic magnetic properties of M-type hexaferrites can be tailored by the cation substitution.…”

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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Key step in synthesis of ultrafine BaFe12O19 by sol-gel technique

Cited by 223 publications

References 26 publications

The Effect of Condensation on the Morphology and Magnetic Properties of Modified Barium Hexaferrite (BaFe12O19)

The Effect of Condensation on the Morphology and Magnetic Properties of Modified Barium Hexaferrite (BaFe12O19)

HYSTERESIS AND ELECTRIC MODULUS ANALYSIS OF Y³⁺ DOPED MnNi-Y-TYPE HEXAGONAL FERRITE

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

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