Synthesis of hexagonal close-packed nanocrystalline nickel by a thermal reduction process

Mi, Yuanzhu; Yuan, Dingsheng; Liu, Yingliang; Zhang, Jingxian; Xiao, Yong

doi:10.1016/j.matchemphys.2004.09.012

Cited by 86 publications

(76 citation statements)

References 21 publications

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“…Also, the antiferromagnetic or paramagnetic behavior of the hcp Ni nanoparticles in the M-H curves were observed, whereas the fcc Ni nanoparticles show ferromagnetic or superparamagnetic behavior. Mi [27]. This ferromagnetic behavior is in accordance with the theory of Papa et al [28].…”

Section: Introductionsupporting

confidence: 91%

“…Studies of magnetic properties of hcp Ni nanoparticles, however, are rare due to the difficulties in synthesizing the hcp Ni. Recently, synthesis and characterization of nanocrystalline hcp Ni have been attracting widespread attention because of their unique magnetic properties and the improved performances by their particle sizes, crystal structures and inter-particle interaction [15][16][17][18][19]. Till now, nanosized Ni can be fabricated by a variety of physical and chemical methods including pyrolysis, sputtering, reversedmicelles, aqueous and nonaqueous chemical reduction, sonochemical deposition, and polyol [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Structural and magnetic properties of hcp and fcc Ni nanoparticles

Gong

Wang

Liu

et al. 2008

Journal of Alloys and Compounds

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Section: Introductionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Structural and magnetic properties of hcp and fcc Ni nanoparticles

Gong

Wang

Liu

et al. 2008

Journal of Alloys and Compounds

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“…Normally, Ni metal crystallizes in the FCC structure, but nanosize Ni can adopt the HCP structure, 51,52 can exist in both FCC and HCP structures, 53 and can even form the BCC lattice. 54 The illustration of crystal structures potentially adopted by Ni ensembles, i.e., FCC, HCP, BCC and amorphous structures, is shown in Fig.…”

mentioning

confidence: 99%

Molecular dynamics study of microscopic structures, phase transitions and dynamic crystallization in Ni nanoparticles

2017

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Using molecular dynamics simulations in conjunction with the quantum-corrected Sutton-Chen potential, we studied the influence of the heating and cooling rates, number of particles, temperature and relaxation , and simultaneously the total potential energy of the investigated systems decreases linearly with the number of Ni atoms.With the help of common neighbor analysis, we detected the coexistence of amorphous and crystalline phases during the whole crystallization process. In the solid state, the dominant crystalline phase is characterized by the FCC and HCP structures, although a very small fraction of the BCC structure may occur at 300 K. It was established that the formation of the FCC structure is favored over the HCP one.In particular, lowering the temperature and increasing the relaxation time favour crystallization of the FCC lattice.

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“…[2,7] When processed through traditional means, nickel is almost always observed with the fcc crystal structure. However, there have been reports of nanocrystalline nickel, produced by chemical routes, [8,9] thermal reduction [10,11] and pulsed laser deposition (PLD), [12] existing with the hexagonal close-packed (hcp) crystal structure. In all of these examples, the supposition and observation have been that the hcp phase is less stable than the fcc phase and that annealing of the material would cause a direct phase transformation to the more stable form.…”

mentioning

confidence: 99%