Electromagnetic and absorption properties of nano-sized and micro-sized Fe 4 N particles

Yu, Meijie; Xu, Yong; Mao, Qiong; Li, Fazhan; Wang, Chengguo

doi:10.1016/j.jallcom.2015.10.005

Cited by 43 publications

(8 citation statements)

References 21 publications

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“…At present, the commonly used methods for preparing spherical Fe are the one-step solvothermal method [35], corrosion method [38], chemical vapor condensation method [39], and gaseous nitridation method [40], etc. Scholars have prepared hollow and porous spherical Fe particle absorbents by various methods.…”

Section: Sphere-like Fementioning

confidence: 99%

“…The absorbing properties were tested by mixing Fe 4 N nanoparticles containing 75 wt% with paraffin wax to make composites with thicknesses ranging from 1.2 to 5.0 mm, with RL ≤ −10 dB in the frequency range of 1.8 to 11 GHz (as shown in Figure 3f). When the absorbent thickness is 3 mm, the RL min value (RL min = −33 dB) is obtained at 3.5 GHz [40].…”

Section: Sphere-like Fementioning

confidence: 99%

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Recent Progress in Iron-Based Microwave Absorbing Composites: A Review and Prospective

et al. 2022

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With the rapid development of communication technology in civil and military fields, the problem of electromagnetic radiation pollution caused by the electromagnetic wave becomes particularly prominent and brings great harm. It is urgent to explore efficient electromagnetic wave absorption materials to solve the problem of electromagnetic radiation pollution. Therefore, various absorbing materials have developed rapidly. Among them, iron (Fe) magnetic absorbent particle material with superior magnetic properties, high Snoek’s cut-off frequency, saturation magnetization and Curie temperature, which shows excellent electromagnetic wave loss ability, are kinds of promising absorbing material. However, ferromagnetic particles have the disadvantages of poor impedance matching, easy oxidation, high density, and strong skin effect. In general, the two strategies of morphological structure design and multi-component material composite are utilized to improve the microwave absorption performance of Fe-based magnetic absorbent. Therefore, Fe-based microwave absorbing materials have been widely studied in microwave absorption. In this review, through the summary of the reports on Fe-based electromagnetic absorbing materials in recent years, the research progress of Fe-based absorbing materials is reviewed, and the preparation methods, absorbing properties and absorbing mechanisms of iron-based absorbing materials are discussed in detail from the aspects of different morphologies of Fe and Fe-based composite absorbers. Meanwhile, the future development direction of Fe-based absorbing materials is also prospected, providing a reference for the research and development of efficient electromagnetic wave absorbing materials with strong absorption performance, frequency bandwidth, light weight and thin thickness.

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Section: Sphere-like Fementioning

confidence: 99%

Section: Sphere-like Fementioning

confidence: 99%

Recent Progress in Iron-Based Microwave Absorbing Composites: A Review and Prospective

et al. 2022

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“…It was also used to understand the steps occurring during the nitriding process [8]. The interaction of ncFe with atmospheres containing ammonia leads to formation of nanocrystalline iron nitrides [9][10][11][12][13][14]. There is a view that these nanocrystalline iron nitrides formed in industrial reaction conditions are the real catalyst in the ammonia synthesis reaction by the creation of highly disordered crystal structures [15].…”

Section: Introductionmentioning

confidence: 99%

Study of Phase Transitions Occurring in a Catalytic System of ncFe-NH3/H2 with Chemical Potential Programmed Reaction (CPPR) Method Coupled with In Situ XRD

Ekiert¹,

Wilk²,

Lendzion-Bieluń³

et al. 2021

Catalysts

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Nitriding of nanocrystalline iron and reduction of nanocrystalline iron nitride with gaseous mixtures of hydrogen with ammonia were studied at 375 °C and atmospheric pressure using the chemical potential programmed reaction (CPPR) method coupled with in situ XRD. In this paper, a series of phase transitions occurring during the processes is shown, and a detailed analysis of the phase composition and the structure of the material is given. The influence of a variable nitriding potential on the lattice parameters of α-Fe, γ′-Fe4N, and ε-Fe3-2N phases is shown. The α phase interplanar space changes irrelevantly in the one phase area but decreases linearly with average increases in crystallite size when α→γ′ transformation occurs. The nanocrystallite size distributions (nCSDs) were determined, with nCSD of the α phase for nitriding and nCSD of the ε phase for reduction. The reduction of the ε phase can occur directly to α or indirectly with an intermediate step of γ′ formation as a result of ε→γ′→α transformations. The determining factor in the reducing process method is the volume of ε phase nanocrystallites. Those with V < 90,000 nm3 undergo direct transformation ε→αFe(N), and V > 90,000 nm3 transforms to αFe(N) indirectly. It was determined at what value of nitriding potential which fraction of the ε phase nanocrystallites starts to reduce

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“…For different applications, high magnetic moment MNPs are demanded for large magnetic torques in drug/gene delivery and cell sorting and separation applications, for high sensitivity magnetic bioassays, as well as for efficient and minimum dose usage in MRI, MPI, and hyperthermia applications. In view of this demand, γ′-Fe 4 N nanoparticles are magnetically soft, chemically stable, cheap, and possess high saturation magnetization (182 emu/g). , Since year 2000, many groups have reported the facile synthesis of high purity γ′-Fe 4 N nanoparticles. − Based on the Fe–N phase diagram, the γ′-Fe 4 N phase forms at the temperature range from 200 to 680 °C . As proposed by the Lehrer diagram, the most stable iron nitride phase could be modified by tuning the nitriding potential that is controlled by the partial pressure of hydrogen and ammonia gas and the nitridation temperature .…”

Section: Introductionmentioning

confidence: 99%

Irregularly Shaped Iron Nitride Nanoparticles as a Potential Candidate for Biomedical Applications: From Synthesis to Characterization

Saha

et al. 2020

ACS Omega

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Magnetic nanoparticles (MNPs) have been extensively used in drug/gene delivery, hyperthermia therapy, magnetic particle imaging (MPI), magnetic resonance imaging (MRI), magnetic bioassays, and so forth. With proper surface chemical modifications, physicochemically stable and nontoxic MNPs are emerging contrast agents and tracers for in vivo MRI and MPI applications. Herein, we report the high magnetic moment, irregularly shaped γ′-Fe4N nanoparticles for enhanced hyperthermia therapy and T2 contrast agent for MRI application. The static and dynamic magnetic properties of γ′-Fe4N nanoparticles are characterized by a vibrating sample magnetometer (VSM) and a magnetic particle spectroscopy (MPS) system, respectively. Compared to the γ-Fe2O3 nanoparticles, γ′-Fe4N nanoparticles show at least three times higher saturation magnetization, which, as a result, gives rise to the stronger dynamic magnetic responses as proved in the MPS measurement results. In addition, γ′-Fe4N nanoparticles are functionalized with an oleic acid layer by a wet mechanical milling process. The morphologies of as-milled nanoparticles are characterized by transmission electron microscopy (TEM), dynamic light scattering (DLS), and nanoparticle tracking analyzer (NTA). We report that with proper surface chemical modification and tuning on morphologies, γ′-Fe4N nanoparticles could be used as tiny heating sources for hyperthermia and contrast agents for MRI applications with minimum dose.

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Electromagnetic and absorption properties of nano-sized and micro-sized Fe 4 N particles

Cited by 43 publications

References 21 publications

Recent Progress in Iron-Based Microwave Absorbing Composites: A Review and Prospective

Recent Progress in Iron-Based Microwave Absorbing Composites: A Review and Prospective

Study of Phase Transitions Occurring in a Catalytic System of ncFe-NH3/H2 with Chemical Potential Programmed Reaction (CPPR) Method Coupled with In Situ XRD

Irregularly Shaped Iron Nitride Nanoparticles as a Potential Candidate for Biomedical Applications: From Synthesis to Characterization

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