Effect of La-Zn Doping on Magnetic Properties of SrFe12O19

La-Zn doped strontium ferrite, Sr1-xZnxFe12(1-x) La12xO19, was prepared by chemical co-precipitation method. The samples were characterized by XRD, SEM and VSM and the results reveal that La-Zn ions are dispersed completely into the strontium ferrite lattice at 900°C. The VSM analysis shows that Hcj increases to 240.1 KA/m, almost double the value of the original sample. And the specific saturation magnetization increases from 48.78 A • m2/Kg to 63.11A• m2/Kg.

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The magnetic properties of permanent strontium ferrite doped with rare-earth by chemical co-precipitation method

Ferroelectrics ◽

10.1080/00150193.2018.1458517 ◽

2018 ◽

Vol 529 (1) ◽

pp. 120-127 ◽

Cited By ~ 5

Author(s):

Ze Wu ◽

Ruonan Zhang ◽

Zhaowei Yu ◽

Lianwei Shan ◽

Limin Dong ◽

...

Keyword(s):

Magnetic Properties ◽

Rare Earth ◽

Strontium Ferrite ◽

Precipitation Method ◽

Co Precipitation

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Technological Conditions and Magnetic Properties of Y-Type Hexaferrite Prepared by Chemical Co-Precipitation Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.412.146 ◽

2011 ◽

Vol 412 ◽

pp. 146-149

Author(s):

Wen Guo Chen ◽

Jian Qing Dai ◽

Jing Bing Xia ◽

Yao Min Ding ◽

Zhi Gang Hu

Keyword(s):

Magnetic Properties ◽

Ph Value ◽

Initial Permeability ◽

Precipitation Method ◽

Particle Sizes ◽

X Ray Diffraction ◽

Specific Saturation Magnetization ◽

Particle Size Analyzer ◽

Co Precipitation

The Y-type hexaferrite precursors was synthesized by co-precipitation, and the pivotal technological conditions, including pH value, temperature (T), rotate speed (R) and the flow velocity of salt solution (V) were discussed. The particles of precursors were studied by Laser particle size analyzer (LPS). The precursor calcined at 900°C was characterized via X-ray Diffraction (XRD), the vibrating sample magnetometer (VSM) and HP4291A impedance analyzer were used to investigated magnetic properties. The results showed that the particle sizes were around 3µm (D50) and the distribution range was from 2.28μm to 4.47μm, in the optimized technological conditions: pH = 10.50, T = 50°C, R = 300 rpm, V = 0.35 ml/min, SDBS = 0.3 g/L, the specific saturation magnetization, coercive force, residual magnetization, initial permeability and factor of quality of the sample were σs≈ 29.72A·m2·kg-1, Hc≈ 4.11/kA·m-1, σr≈ 7.74 A·m2·kg-1, μi≈ 9 and Q ≈ 18 respectively.

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Influence of hydrogenation conditions on the structural, optical, and magnetic properties of degenerated Ni/Al co-doped anatase nanocomposite

10.21203/rs.3.rs-84110/v1 ◽

2020 ◽

Author(s):

A. A. Dakhel

Keyword(s):

Magnetic Properties ◽

Saturation Magnetization ◽

Magnetic Energy ◽

Substitutional Solid Solution ◽

Precipitation Method ◽

Optical Absorption Spectroscopy ◽

Doped Tio2 ◽

Itinerant Electrons ◽

Two Factors ◽

Co Precipitation

Abstract In the present work, pristine and Ni2+/Al3+- codoped anatase (TiO2) nanocomposite powders were synthesized by the thermal co-precipitation method. The samples were characterized by several techniques. The X‐Ray diffraction (XRD) was used for structural characterization and the optical absorption spectroscopy was used for the optical characterization. The structural/optical studies proved the formation of a substitutional solid solution (SSS). The magnetization measurements were performed to investigate the magnetic properties of the synthesized samples. In the present work, nickel (Ni2+) dopant ions were used to introduce stable ferromagnetic (FM) properties into the synthesized anatase, while Al3+ dopant ions were utilized to supply itinerant electrons necessary to support and boost the created FM properties. The roadmap of the present work was to establish the hydrogenation conditions necessary to create ferromagnetic (FM) properties in the host codoped samples and study the effect of hydrogenation temperature on the parameters of the created FM properties, especially the magnetic energy (Umag) and saturation magnetization (Msat). It was found that the created FM properties in Ni/Al-doped TiO2 nanocomposite powder by using the hydrogenation effect could be enhanced and controlled via the temperature of the hydrogenation (TH). The experimental results revealed that Umag of TiO2:Ni:Al system increased by ~241% and the saturation magnetization by ~140% with increasing of TH by 100 oC (from 400 oC to 500oC). The obtained saturation magnetization (Msat) of 1.09 emu/g and magnetic energy (Umag) of 42.6 erg/g were higher than the previously obtained values for created Ni-doped TiO2 by ~50 times. Such great novel results were obtained due to dealing with two factors; the Al3+ ions as co-dopant, which can supply an excess of itinerant electrons that boost the S.S Heisenberg interactions in addition to choosing a suitable temperature of hydrogenation.

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Impact of Iron on the Fe–Co–Ni Ternary Nanocomposites Structural and Magnetic Features Obtained via Chemical Precipitation Followed by Reduction Process for Various Magnetically Coupled Devices Applications

Nanomaterials ◽

10.3390/nano11020341 ◽

2021 ◽

Vol 11 (2) ◽

pp. 341

Author(s):

Tien Hiep Nguyen ◽

Gopalu Karunakaran ◽

Yu.V. Konyukhov ◽

Nguyen Van Minh ◽

D.Yu. Karpenkov ◽

...

Keyword(s):

Particle Size ◽

Magnetic Properties ◽

Reduction Process ◽

Chemical Precipitation ◽

Precipitation Method ◽

Magnetic Characteristics ◽

Reduction Temperature ◽

Fe Content ◽

Magnetic Features ◽

Co Precipitation

This paper presents the synthesis of Fe–Co–Ni nanocomposites by chemical precipitation, followed by a reduction process. It was found that the influence of the chemical composition and reduction temperature greatly alters the phase formation, its structures, particle size distribution, and magnetic properties of Fe–Co–Ni nanocomposites. The initial hydroxides of Fe–Co–Ni combinations were prepared by the co-precipitation method from nitrate precursors and precipitated using alkali. The reduction process was carried out by hydrogen in the temperature range of 300–500 °C under isothermal conditions. The nanocomposites had metallic and intermetallic phases with different lattice parameter values due to the increase in Fe content. In this paper, we showed that the values of the magnetic parameters of nanocomposites can be controlled in the ranges of MS = 7.6–192.5 Am2/kg, Mr = 0.4–39.7 Am2/kg, Mr/Ms = 0.02–0.32, and HcM = 4.72–60.68 kA/m by regulating the composition and reduction temperature of the Fe–Co–Ni composites. Due to the reduction process, drastic variations in the magnetic features result from the intermetallic and metallic face formation. The variation in magnetic characteristics is guided by the reduction degree, particle size growth, and crystallinity enhancement. Moreover, the reduction of the surface spins fraction of the nanocomposites under their growth induced an increase in the saturation magnetization. This is the first report where the influence of Fe content on the Fe–Co–Ni ternary system phase content and magnetic properties was evaluated. The Fe–Co–Ni ternary nanocomposites obtained by co-precipitation, followed by the hydrogen reduction led to the formation of better magnetic materials for various magnetically coupled device applications.

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Structural, morphological, and magnetic properties of ZnxCo1-xFe2O4 (0 ≤ x ≤ 1) prepared using a chemical co-precipitation method

Ceramics International ◽

10.1016/j.ceramint.2018.08.079 ◽

2018 ◽

Vol 44 (17) ◽

pp. 20782-20789 ◽

Cited By ~ 12

Author(s):

Rohit R. Powar ◽

Varsha D. Phadtare ◽

Vinayak G. Parale ◽

Hyung-Ho Park ◽

Sachin Pathak ◽

...

Keyword(s):

Magnetic Properties ◽

Precipitation Method ◽

Co Precipitation

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X-ray absorption spectroscopy analysis and magnetic properties of M-doped TiO 2 nanoparticles (M=Co, Mn, Ni and Zn) prepared by co-precipitation method

Ceramics International ◽

10.1016/j.ceramint.2017.05.188 ◽

2017 ◽

Vol 43 ◽

pp. S397-S402 ◽

Cited By ~ 5

Author(s):

Chakkaphan Wattanawikkam ◽

Wisanu Pecharapa ◽

Keiichi N. Ishihara

Keyword(s):

Magnetic Properties ◽

Absorption Spectroscopy ◽

Precipitation Method ◽

Spectroscopy Analysis ◽

X Ray ◽

Co Precipitation ◽

X Ray Absorption

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LOW-TEMPERATURE SYNTHESIS OF SUPERPARAMAGNETIC Zn0.8Ni0.2Fe2O4 FERRITE NANOPARTICLES

Vietnam Journal of Science and Technology ◽

10.15625/2525-2518/56/1/9805 ◽

2018 ◽

Vol 56 (1) ◽

pp. 31

Author(s):

Luong Thi Quynh Anh ◽

Nguyen Van Dan ◽

Do Minh Nghiep

Keyword(s):

Particle Size ◽

Magnetic Properties ◽

Oleic Acid ◽

Low Temperature ◽

Coercive Force ◽

Saturation Magnetization ◽

Ferrite Nanoparticles ◽

Low Temperature Synthesis ◽

Temperature Synthesis ◽

Co Precipitation

The crystalline nanoparticles of Ni0.2Zn0.8Fe2O4 ferrite were synthesized by chemical co-precipitation with precursor concentration of 0.1M, then modified by 0.25M solution of oleic acid in pentanol, finally heated at temperatures 120, 140, 160 and 180oC for 6h in autoclave. The XRD, EDS and TEM confirmed that all of samples are crystalline and their particle size are 6, 6.5, 7 and 8 nm. The magnetic properties showed that the coercive force, the remanence of samples are about zero, the saturation magnetization Ms has values from 14.20 to 27.12 emu/g.

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