Structural and Magnetic Properties of BaCo&amp;lt;sub&amp;gt;x&amp;lt;/sub&amp;gt;Fe&amp;lt;sub&amp;gt;12x&amp;lt;/sub&amp;gt;O&amp;lt;sub&amp;gt;19&amp;lt;/sub&amp;gt; (x = 0.2, 0.4, 0.6, &amp;amp;1.0) Nanoferrites Synthesized via Citrate Sol-Gel Method

Singhal, Sonal; Kaur, Kirandish; Jauhar, Sheenu; Bhukal, Santosh; Bansal, Sandeep

doi:10.4236/wjcmp.2011.13016

Cited by 23 publications

(5 citation statements)

References 17 publications

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“…The XRD patterns of the ferrite samples show characteristic diffraction peaks corresponding to the M-type barium ferrite structure, having point group P63/mmc, indicating that the crystal structure does not transform and remains hexagonal magnetoplumbite after substitution with cobalt ions. This phenomenon was also reported by Sonal Singhal [8]. The XRD pattern for pure Sr 0.5 Ba 0.5 Fe 12 O 19 is in good agreement with JCPDS data (Cardno.51-1879).…”

Section: Resultssupporting

confidence: 89%

Structural and Magnetic Behavior of Cobalt Doped Ba0.5Sr0.5Fe12O19 Nanoparticles Synthesized by Chemical Co-Precipitation Technique

Zhang

Dong

et al. 2013

AMM

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Nanocrystalline M-type Co2+ substituted barium hexaferrites samples having generic formula barium Ba0.5Sr0.5Fe12-xCoxO19 (x=0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) were synthesized by chemical co-precipitation method. The sintered samples were characterized by XRD, SEM and VSM techniques. All the XRD patterns showed the single phase of the magnetoplumbite barium ferrite without other intermediate phase. The lattice parameters (a and c) obtained from XRD data decreases with increase in cobalt content x. The magnetic behavior of the samples was studied using vibrating sample magnetometer technique. The saturation magnetization (Ms) first increases reaching a maximum of 63.684 emu/g at x=0.4, and then decreases. The coercivity (Hc) decreases with increase in cobalt content x.

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Section: Resultssupporting

confidence: 89%

Structural and Magnetic Behavior of Cobalt Doped Ba0.5Sr0.5Fe12O19 Nanoparticles Synthesized by Chemical Co-Precipitation Technique

Zhang

Dong

et al. 2013

AMM

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“…Singhal et. al [15] shows the values of magnetic coercivity of Ba ferrites via sol-gel synthesis is 3500 Oe (4% Co) and 1750 Oe (10 % Co) much higher than our samples. This is attribute to impurities content in the steel waste product effect on the magnetic properties of our samples [18].…”

Section: Resultscontrasting

confidence: 57%

“…Teh et al [17] synthesized Co substituted Ba ferrites via sol-gel method, found that Co doping decreases the value of coercivity significantly. Singhal et.al [15] also reported the coercivity of Ba ferrites decreases with increasing Co substitution. The reported results are agreed with this work.…”

Section: Resultsmentioning

confidence: 88%

“…Generally, the trend shows decreasing value of coercivity H c and remanence M r with increasing Co doping, except at 3 % and 20 %. This is attributed to the lesser magnetic moment of cobalt Co 2+ ions (3 µB) as compared to iron Fe 3+ ions (5 µB) and their substitution in 12k and 2a sites of the lattice, in preference to the 4f2 sites [15]. The coercivity value decreases from 860 to 476 Oe with increasing cobalt concentration due to reduction in magnetocrystalline anisotropy.…”

Section: Resultsmentioning

confidence: 99%

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Magnetic Properties and Microstructures of Cobalt Substituted Barium Hexaferrites Derived from Steel Waste Product via Mechanical Alloying Technique

Azis

Hashim

Zakaria

et al. 2016

MSF

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The mechanical alloying technique was used to prepare barium hexaferrite (BaM) with 3, 5, 10 and 20 wt% cobalt oxide (Co3O4). In this work, steel waste flakes were cold-rolling steel mill for several hours to form a fine powder. The steel waste powder was purified by using magnetic separation to isolate the magnetic and non magnetic particles. The method was continued for Curie temperature separation technique to separate the magnetic ions by varied Curie temperature of the magnetic powder. The purified powder was then oxidize at 500 °C at 6 °C/mins to form hematite, Fe2O3. The steel waste-derived hematite was used as the raw material in preparing BaM ferrites. The BaCO3, Fe2O3 and different percentages of Co3O4 (Co) were mixed and milled for several hours by using mechanical alloying. The powder were pelletised in 11 × 1 mm (diameter × height) and the sintered at 1200 °C for 10 hours. The addition of Co2+/3+ ions to the BaM shows a varying in the magnetic properties of BaM. By increasing the Co doping, the remanence Mr was reduced from 17.6 emu/g to 6.2 emu/g. The coercivity Hc results varying magnitude from 102 Oe to 1079 Oe. The Mr and Hc of undoped BaM is obtain at 14.6 emu/g and 860 Oe, respectively. The grain size of BaM also increases with Co doping. The densities of the compounds are decreasing with increasing Co doping with a maximum value of 4.2 g/cm3.

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“…The effect of substitution/addition on the physical properties of BaFe 12 O 19 has been recorded in many literatures. Substitutions can be done by the partial replacement of Fe 3+ ions with other cations such as Mn-Sn, Co-Sn and Mn-Co-Sn [21], Co [22,23] and Ni [24]. Moreover, substitutions can be done by the partial replacement of Ba 2+ ions with other cations as reported by Taufeeq et al [25] for studying the structural and thermal properties of pure BaFe 12 O 19 and Sr doped Ba 0.9 Sr 0.1 Fe 12 O 19 nanostructure.…”

Section: Introductionmentioning

confidence: 99%

Influence of cobalt addition and calcination temperature on the physical properties of BaFe₁₂O₁₉ hexaferrites nanoparticles

Rekaby

Shehabi

Awad

2020

Mater. Res. Express

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Nano-scale particles of pure Barium hexaferrite 'BaFe 12 O 19 ' and Cobalt added Barium hexaferrite 'Co x BaFe 12 O 19 ', with x=0.04, 0.06 and 0.1 wt%, were successfully synthesized by the chemical coprecipitation method. The synthesized powder was subjected to different calcination temperatures (T=850°C, 900°C, 950°C and 1050°C). X-ray powder diffraction (XRD) clarified that nearly single phase of BaFe 12 O 19 with tiny traces of Fe 2 O 3 phase were obtained when the precursor was calcined at 1050°C for 2 h. The lattice parameters and unit cell volume were almost unchanged with either Cobalt addition or calcination temperatures. From Debye-Scherrer equation, the crystallite size (D) was found to gradually increase with increasing calcination temperature to reach its maximum values for samples calcined at 1050°C. The formation of Barium hexaferrite phase was also confirmed from Fourier transform infrared (FTIR) spectra through the existence of strong absorption peaks that appeared between 581 cm −1 and 435 cm −1 . The morphology and grain size of the samples were examined using transmission electron microscopy (TEM) technique. Optical properties of the samples were studied through ultraviolet 'UV' visible spectroscopy. The optical band gap (E g ) of the samples was obtained from Tauc relation as function of Cobalt addition (x) and calcination temperature (T). Finally, the mechanical properties were examined using Vickers microhardness. The microhardness data revealed that the samples exhibited reverse indentation size effect (RISE). The Elastic modulus (E) and yield strength (Y) for the prepared samples were calculated, in accordance with Vickers microhardness, as function of Cobalt addition. Furthermore, the indentation size effect ISE was analyzed using indentation induced cracked model (IIC). The IIC model was found to be a suitable model for describing the microhardness results of the prepared samples. Time dependent Vickers microhardness was done through indentation creep test at different dwell time (t=10, 20, 30, 40 and 50 s) and constant applied loads (F=0.98, 4.90 and 9.80 N). Results clarified that the specimens revealed grain boundary sliding together with dislocation climbs at small loads and a dislocation creep in the operating creep process for greater loads.

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Structural and Magnetic Properties of BaCo<sub>x</sub>Fe<sub>12x</sub>O<sub>19</sub> (x = 0.2, 0.4, 0.6, &1.0) Nanoferrites Synthesized via Citrate Sol-Gel Method

Abstract: ABSTRACT

Cited by 23 publications

References 17 publications

Structural and Magnetic Behavior of Cobalt Doped Ba0.5Sr0.5Fe12O19 Nanoparticles Synthesized by Chemical Co-Precipitation Technique

Structural and Magnetic Behavior of Cobalt Doped Ba0.5Sr0.5Fe12O19 Nanoparticles Synthesized by Chemical Co-Precipitation Technique

Magnetic Properties and Microstructures of Cobalt Substituted Barium Hexaferrites Derived from Steel Waste Product via Mechanical Alloying Technique

Influence of cobalt addition and calcination temperature on the physical properties of BaFe₁₂O₁₉ hexaferrites nanoparticles

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Structural and Magnetic Properties of BaCo&lt;sub&gt;x&lt;/sub&gt;Fe&lt;sub&gt;12x&lt;/sub&gt;O&lt;sub&gt;19&lt;/sub&gt; (x = 0.2, 0.4, 0.6, &amp;1.0) Nanoferrites Synthesized via Citrate Sol-Gel Method

Abstract: ABSTRACT

Cited by 23 publications

References 17 publications

Structural and Magnetic Behavior of Cobalt Doped Ba0.5Sr0.5Fe12O19 Nanoparticles Synthesized by Chemical Co-Precipitation Technique

Structural and Magnetic Behavior of Cobalt Doped Ba0.5Sr0.5Fe12O19 Nanoparticles Synthesized by Chemical Co-Precipitation Technique

Magnetic Properties and Microstructures of Cobalt Substituted Barium Hexaferrites Derived from Steel Waste Product via Mechanical Alloying Technique

Influence of cobalt addition and calcination temperature on the physical properties of BaFe12O19 hexaferrites nanoparticles

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Structural and Magnetic Properties of BaCo<sub>x</sub>Fe<sub>12x</sub>O<sub>19</sub> (x = 0.2, 0.4, 0.6, &1.0) Nanoferrites Synthesized via Citrate Sol-Gel Method

Influence of cobalt addition and calcination temperature on the physical properties of BaFe₁₂O₁₉ hexaferrites nanoparticles