Surfactant-Assisted Preparation and Magnetic Properties of Iron-Based Nanowires

Miura, Kôji; Itoh, Masahiro; Machida, Ken‐ichi

doi:10.1143/jjap.47.2342

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…On the other hand, h structure ͑or a pseudohexagonal lattice͒ was often observed in the crystallization of amorphous alloys [1][2][3] and carburization of iron. [9][10][11][12][13] It is well known that complex processes such as nucleation and growth of a carbide in amorphous alloys, carburization, and precipitation in steels depend on many factors, such as chemical composition, thermal history, temperature, and interface interactions with the other phases. Our calculations show that the o-Fe 7 C 3 has a more stable Fe sublattice and may contain carbon ͑vacancy͒ defects.…”

Section: Formation Of the Fe 7 C 3 Phasesmentioning

confidence: 99%

“…27 On the other hand, it has been reported that carburization of ferrite will produce mainly nanosized particles of h-Fe 7 C 3 from chemically produced C clusters. [9][10][11][12][13] For the nanocrystals obtained by methods such as carburization of iron, the defects causing the formation of different Fe 7 C 3 lattices may not be observed by methods such as x-ray diffraction. Audier and co-workers obtained microcrystals of o-Fe 7 C 3 by disproportioning CO on Fe at 500°C, 14 suggesting that the h phase transformed into the o phase ͑through stacking fault generation͒ as the nanoparticles increase in size.…”

Section: Formation Of the Fe 7 C 3 Phasesmentioning

confidence: 99%

“…6 Fe 7 C 3 forms also as nanoparticles by means of high-pressure techniques [7][8][9] or by carburization of ferrite. [10][11][12][13] Audier and co-workers obtained Fe 7 C 3 microcrystals by disproportioning CO on Fe at 500°C.…”

Section: Introductionmentioning

confidence: 99%

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Structural, electronic, and magnetic properties of iron carbideFe7C3phases from first-principles theory

2009

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The iron carbide Fe 7 C 3 exhibits two types of basic crystal structures, an orthorhombic ͑o-͒ form and a hexagonal ͑h-͒ one. First-principles calculations have been performed for the basic Fe 7 C 3 forms and for the related -Fe 3 C cementite phase. Accurate total-energy calculations show that the stability of Fe 7 C 3 is comparable to that of -Fe 3 C. The o-Fe 7 C 3 phase is more stable than the hexagonal one, in contrast to recent atomistic simulations. Furthermore, the calculations also show a rather low energy for a carbon vacancy in the o structure, which implies possible C deficiency in the lattice. Both Fe 7 C 3 phases are ferromagnetic metals. Electronic band-structure calculations show that all Fe atoms exhibit high-spin states with the majority of their 3d states being almost fully occupied. From an analysis of the structural and energetic properties, the formation of the o phase in steel treatment processes and of h form in carburization of ferrite is discussed.

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Section: Formation Of the Fe 7 C 3 Phasesmentioning

confidence: 99%

Section: Formation Of the Fe 7 C 3 Phasesmentioning

confidence: 99%

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Structural, electronic, and magnetic properties of iron carbideFe7C3phases from first-principles theory

2009

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The one-step preparation of nanowires using a facile ultrafiltration technique: the case for biomedical chitosan and/or iron oxide nanowires

Chang¹,

Wang²,

Chung³

2011

J. Mater. Chem.

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This work presents the employment of a frequently-used ultrafiltration technique to drastically reduce the time required for the synthesis of chitosan nanowires, iron oxide nanowires and their complex nanowires. Instead of synthesizing iron oxide nanowires using time-consuming template and hydrothermal methods, a centrifugation force provides a tangential flow to force both iron ions and/or the diluted chitosan solution to pass through a filter and co-precipitate into nanowires within 1 min. Two parameters, centrifugation force and alkaline concentration, can directly control the diameters and lengths of nanowires. Experimental Preparation of nanowiresIron(III) chloride hexahydrate and iron(II) chloride tetrahydrate were purchased from Merck Co. and used as received. Iron oxide

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Solvothermal synthesis of Fe7C3 and Fe3C nanostructures with phase and morphology control

Williams

Clifford

El-Gendy

et al. 2016

Journal of Applied Physics

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A phase transition, from orthorhombic Fe3C to hexagonal Fe7C3, was observed using a wet synthesis mediated by hexadecyltrimethylammonium chloride (CTAC). In this study, CTAC has been shown to control carbide phase, morphology, and size of the iron carbide nanostructures. Fe7C3 hexagonal prisms were formed with an average diameter of 960 nm, the thickness of 150 nm, and Fe3C nanostructures with an approximate size of 50 nm. Magnetic studies show ferromagnetic behavior with Ms of 126 emu/g, and Hc of 170 Oe with respect to Fe7C3 and 95 emu/g and 590 Oe with respect to Fe3C. The thermal studies using high temperature x-ray diffraction show stability of Fe7C3 up to 500 °C. Upon slow cooling, the Fe7C3 phase is recovered with an intermediate oxide phase occurring around 300 °C. This study has demonstrated a simple route in synthesizing iron carbides for an in depth magnetic study and crystal phase transition study of Fe7C3 at elevated temperatures.

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Surfactant-Assisted Preparation and Magnetic Properties of Iron-Based Nanowires

Cited by 4 publications

References 18 publications

Structural, electronic, and magnetic properties of iron carbideFe7C3phases from first-principles theory

Structural, electronic, and magnetic properties of iron carbideFe7C3phases from first-principles theory

The one-step preparation of nanowires using a facile ultrafiltration technique: the case for biomedical chitosan and/or iron oxide nanowires

Solvothermal synthesis of Fe7C3 and Fe3C nanostructures with phase and morphology control

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