Structure and hard magnetic properties of barium hexaferrite with and without La2O3 prepared by ball milling

Babu, V.; Padaikathan, Pambannan

doi:10.1016/s0304-8853(01)00811-3

Cited by 30 publications

(12 citation statements)

References 2 publications

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“…This value is in good agreement with the reported value for a similar sample grown by ball milling method [15] but smaller than the reported values for similar samples grown by different techniques [12,30,40]. The saturation magnetization at 2 K is obtained from the law of approach to saturation [41]:…”

Section: Methodssupporting

confidence: 88%

“…Several techniques have been used to prepare M-type hexaferrites such as coprecipitation method [9], sol-gel auto-combustion method [10], hydrothermal process [11], ammonium nitrate melt method [12], microwave-induced combustion [13], mechano-combustion route [14], and ball milling method [15,16]. Ball milling is userfriendly and simple method suitable for the production of powders composed of fine particles smaller than the single domain size.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic study of M-type doped barium hexaferrite nanocrystalline particles

Alsmadi

Bsoul

Mahmood

et al. 2013

Journal of Applied Physics

122

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Co-Ti and Ru-Ti substituted barium ferrite nanocrystalline particles BaFe 12-2x ) were prepared by ball milling method, and their magnetic properties and their temperature dependencies were studied. The zero-field-cooled (ZFC) and field-cooled (FC) processes were recorded at low magnetic fields and the ZFC curves displayed a broad peak at a temperature T M . In all samples under investigation, a clear irreversibility between the ZFC and FC curves was observed below room temperature, and this irreversibility disappeared above room temperature. These results were discussed within the framework of random particle assembly model and associated with the magnetic domain wall motion. The resistivity data show some kind of a transition from insulator to perfect insulator around M T . At 2 K, the saturation magnetization slightly decreased and the coercivity dropped dramatically with increasing the Co-Ti concentration x. With Ru-Ti substitution, the 2 saturation magnetization showed small variations, while the coercivity decreased monotonically, recording a reduction of about 73% at x = 0.6. These results were discussed in light of the single ion anisotropy model and the cationic distributions based on previously reported neutron diffraction data for the CoTi substituted system, and the results of our Mössbauer spectroscopy data for the RuTi substituted system.

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Section: Methodssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Magnetic study of M-type doped barium hexaferrite nanocrystalline particles

Alsmadi

Bsoul

Mahmood

et al. 2013

Journal of Applied Physics

122

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“…The BaFe 12 O 19 has great importance for the modern society because they are component of a variety of electronic devices used in means of magnetic recording, communication, generation and distribution of electrical energy, automotive and medical equipments. Besides they may be used as magneto in purifiers of water, eliminating certain metallic impurities, separator of mineral paramagnetic in minerals and directionally of bunches of particles loaded electrically (accelerators of particles) [2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Sintering temperature dependence of optimized microstructure formation of BaFe12O19 using sol–gel method

Kanagesan

Hashim

Kalaivani

et al. 2014

J Mater Sci: Mater Electron

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In an attempt to obtain the best possible properties of barium hexaferrite (BaFe 12 O 19 ), the sol-gel synthesis method was chosen and, the optimum sintering conditions were established. The effects of the sintering temperature on the structural, morphological and magnetic properties of hexaferrite were studied. X-ray analysis indicates that the sintered samples (1,000-1,150°C) remained in the hexagonal structure. From this analysis, no secondary phases are identified. The effect of sintering temperature on the grain growth of BaFe 12 O 19 is confirmed by the microstructure using HR-SEM and is in good agreement with the XRD analysis based on the peak intensity of the (107) plane. The samples sintered at 1,150°C showed the densities as *93 % of theoretical density. Sintering temperature affected the grains in compact samples. The results show that homogeneous and dense BaFe 12 O 19 ceramics obtained at a lower sintering temperature of 1,150°C which is lower than the normally reported sintering temperature of C1,200°C. The thermal treatment can markedly affect the grains in compact samples.

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“…Over 32 the past few decades permanent magnets have been widely 33 used with the introduction of hexagonal ferrites with com-34 position MeFe 12 O 19 where Me = Ba, Sr or Pb. These mate-35 rials have a wide range of permanent magnetic applications 36 such as the media for magnetic, magneto-optical recording, 37 high frequency core materials and in some other technological 38 applications [2,3].…”

mentioning

confidence: 99%

“…Since the structural, electro-magnetic and 43 dielectric properties of hexaferrites vary strongly with the 44 composition, in this work, we have prepared Ba-hexaferrites 45 (BaM) with following non-stoichiometric compositions: 46 (BaO) 1-x [4,5]. Babu et al [12] studied the structural and hard 57 magnetic properties of Ba-hexaferrites with the addition of 58 La 2 O 3 and reported that the magnetic properties of such 59 ferrites have been improved remarkably with the addition 60 of La 2 O 3 , which acts as grain refiner. Grossinger et al [13] 61 have studied the La-Co substituted Ba-hexaferrite and 62 reported that the anisotropy as well as the coercivity 63 increases with the increase in La-Co content.…”

mentioning

confidence: 99%

Investigation of magnetic, dielectric and electrical properties of Ba-hexaferrites

et al. 2012

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15 Abstract: Ba-hexaferrites of composition (BaO) 1-x (La 2 O 3 ) x 5.7 Fe 2 O 3 , where x = 0.00, 0.04, 0.08 and BaO 5.7 16 Fe 2 O 3 ? [0.7 wt% CaO ? 0.3 wt% SiO 2 ] were prepared by standard double sintering ceramic technology using magnetite 17 from Cox's Bazar beach sand, Bangladesh. In this work, magnetic, dielectric and electrical properties of Ba-hexaferrites 18 with and without additives have been reported. Measurements of permeability, loss factor, quality factor (Q-factor), 19 resistivity and dielectric constant of the synthesized samples have been carried out. Permeability remains unaltered in the 20 observed frequency range. The loss factor increases with the increase in temperature and additives as well. It has been 21 observed that the loss factor decreases with the increase in frequency. The Q-factor decreases with the increase in 22 temperature and increases with the increase in frequency. The dielectric constant decreases with the increase in frequency. 23 The ac resistivity of Ba-hexaferrites increases with the increase in additive contents.

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Structure and hard magnetic properties of barium hexaferrite with and without La2O3 prepared by ball milling

Cited by 30 publications

References 2 publications

Magnetic study of M-type doped barium hexaferrite nanocrystalline particles

Magnetic study of M-type doped barium hexaferrite nanocrystalline particles

Sintering temperature dependence of optimized microstructure formation of BaFe12O19 using sol–gel method

Investigation of magnetic, dielectric and electrical properties of Ba-hexaferrites

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