Spark plasma sintering and microwave electromagnetic properties of MnFe O4 ceramics

Reddy, M. Penchal; Mohamed, A.M.A.; Ramana, M. Venkata; Zhou, Xiaobing; Huang, Qing

doi:10.1016/j.jmmm.2015.07.003

Cited by 20 publications

(4 citation statements)

References 31 publications

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“…Due to their strong surface energy and magnetic properties, nanometer ferrite functional magnetic particles are extremely prone to aggregation during the preparation process [13]. To solve the problem of particle aggregation, researchers have used different techniques to synthesize ferrite functional materials, such as hydrometallurgical technologies [13][14][15][16], solid-state reaction methods [17][18][19][20][21][22][23][24][25], combined electrochemical and chemical methods [26,27] and combined pyro-and hydrometallurgical metallurgical technology [11,28,29].…”

Section: Introductionmentioning

confidence: 99%

“…Ding et al [25] showed that the maximum saturation magnetization of MnFe 2 O 4 samples formed after annealing at 600~700 • C increased from 54 emu/g to 79 emu/g. Reddy et al [22] performed spark plasma sintering (SPS) of the hydrothermally pretreated material to obtain a soft magnetic material MnFe 2 O 4 with a maximum saturation magnetization of 82.5 emu/g. To date, much research has been carried out on the preparation of MnFe 2 O 4 with the solid-phase reaction method [18,30,31], and the experiments have proven that the magnetic properties of manganese ferrite are closely related to the structure and morphology of the crystal [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Systematic Study on the Synthesis and Magnetism Properties of Manganese Ferrite MnFe2O4 by an Oxidation Roasting Process

Wen,

Chen,

Zhang

et al. 2023

Crystals

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A low-cost and high-efficiency solid reaction method has been reported as an effective technology to synthesize manganese ferrite MnFe2O4 with a spinel crystal structure. This work clarified the underlying reason for the influence mechanism of SiO2 and Al2O3 on the synthesis of MnFe2O4. Synthetic MnFe2O4 polyhedral microparticles with a saturated magnetization of 71.19 emu/g, a ratio of saturation magnetization to residual magnetization (Ms/Mr) of 0.062 and a coercivity (Hc) of 6.50 Oe were successfully obtained at an oxidization roasting temperature of 1100 °C for 60 min. The experimental results indicate that the tetrahedral Mn2+ ions and octahedral Mn3+ ions in the crystal structure of manganese ferrite MnFe2O4 were replaced by tetrahedral Si2+ ions and octahedral Al3+ ions from (Mn2+)x(Fe2+)y(Si2+)1−x−y[Fe3+]2O4 and (Mn2+)[Fe3+]2−x[Al3+]xO4, respectively. In addition, hercynite FexMn1−xAl2O4 with a spinel crystal structure and olivine MnxFe2−xSiO4 with an orthorhombic crystal structure were partially formed in the synthesis of manganese ferrite MnFe2O4, in which some Fe2+ ions were easily replaced by Mn2+ ions to form stable hercynite MnAl2O4 and olivine Mn2SiO4 in these crystal structures. The current research work provides comprehensive insights for synthesizing manganese ferrite MnFe2O4 and continuously advances its technical progress.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Systematic Study on the Synthesis and Magnetism Properties of Manganese Ferrite MnFe2O4 by an Oxidation Roasting Process

Wen,

Chen,

Zhang

et al. 2023

Crystals

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“…Such as M.P. Reddy et al [16] synthesized the MnFe 2 O 4 ferrite by a facile hydrothermal route and then consolidated into dense nanostructured compacts by the spark plasma sintering technique, the magnetic analysis indicated that the MnFe 2 O 4 ferrite showed ferromagnetic behavior and can be applied in the microwave absorbing area.…”

Section: Introductionmentioning

confidence: 99%

Preparation of SiO2-MnFe2O4 Composites via One-Pot Hydrothermal Synthesis Method and Microwave Absorption Investigation in S-Band

et al. 2019

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MnFe2O4 NPs are successfully decorated on the surface of SiO2 sheets to form the SiO2-MnFe2O4 composite via one-pot hydrothermal synthesis method. The phase identification, morphology, crystal structure, distribution of elements, and microwave absorbing properties in S-band (1.55~3.4 GHz) of the as-prepared composite were investigated by XRD, SEM, TEM, and Vector Network Analyzer (VNA) respectively. Compared with the pure MnFe2O4 NPs, the as-prepared SiO2-MnFe2O4 composite exhibits enhanced microwave absorption performance in this frequency band due to the strong eddy current loss, better impedance matching, excellent attenuation characteristic, and multiple Debye relaxation processes. The maximum reflection loss of −14.87 dB at 2.25 GHz with a broader −10 dB bandwidth over the frequency range of 1.67~2.9 GHz (1.23 GHz) can be obtained at the thickness of 4 mm. Most importantly, the preparation method used here is relatively simple, hence such composite can be served as a potential candidate for effective microwave absorption in S-band.

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“…It is well known that MAMs can attenuate electromagnetic waves by converting electromagnetic energy into heat energy or by dissipating it via all kinds of loss mechanisms. At this stage, MAMs have already been extensively investigated; they include carbon materials [5,6,7], conducting polymers [8,9,10], ceramic materials [11,12,13], magnetic metals and alloys [14,15,16], ferrites [17,18,19], etc. Among these materials, ferrites are widely used as MAMs for their advantages of high Curie temperature, special magnetic property, good chemical and thermo-stability, and low costs [20].…”

Section: Introductionmentioning

confidence: 99%

Two-Step Solvothermal Synthesis of (Zn0.5Co0.5Fe2O4/Mn0.5Ni0.5Fe2O4)@C-MWCNTs Hybrid with Enhanced Low Frequency Microwave Absorbing Performance

Yin

Zhang

et al. 2019

Nanomaterials

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In this study, the quaternary hybrid of (Zn0.5Co0.5Fe2O4/Mn0.5Ni0.5Fe2O4)@C-MWCNTs with high-performance in low frequency electromagnetic absorption was synthesized via a facile two-step solvothermal synthesis method. The physicochemical properties as well as electromagnetic parameters and microwave absorption performance were characterized by XRD, SEM, TEM, RS, TGA, and VNA, respectively. The results indicate a nuclear-shell morphology of this hybrid for amorphous carbon coated on the surface of Zn0.5Co0.5Fe2O4 and Mn0.5Ni0.5Fe2O4 mixed polycrystalline ferrites. In addition, the MWCNTs synchronously enwind in the nuclear-shell NPs to form a special cross-linking structure. The outstanding low frequency microwave absorption property is attributed to the synergistic effect of dielectric and magnetic loss, better impedance matching condition, and excellent attenuation characteristics of the as-prepared paramagnetic quaternary hybrid. Maximum RL of −35.14 dB at 0.56 GHz with an effective absorption bandwidth in the range of 0.27–1.01 GHz can be obtained with thickness of 5 mm. This hybrid exhibits superior low frequency microwave absorption properties compared with other ferrite-carbon nanocomposites. This investigation provides a new route to prepare suitable candidates for the absorption of electromagnetic waves in a low frequency band on account of its good performance and simple preparation process.

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Spark plasma sintering and microwave electromagnetic properties of MnFe O4 ceramics

Cited by 20 publications

References 31 publications

Systematic Study on the Synthesis and Magnetism Properties of Manganese Ferrite MnFe2O4 by an Oxidation Roasting Process

Systematic Study on the Synthesis and Magnetism Properties of Manganese Ferrite MnFe2O4 by an Oxidation Roasting Process

Preparation of SiO2-MnFe2O4 Composites via One-Pot Hydrothermal Synthesis Method and Microwave Absorption Investigation in S-Band

Two-Step Solvothermal Synthesis of (Zn0.5Co0.5Fe2O4/Mn0.5Ni0.5Fe2O4)@C-MWCNTs Hybrid with Enhanced Low Frequency Microwave Absorbing Performance

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