Effect of particle size on the magnetic properties of NiB

Mutlu, R.H.; Aydinuraz, A

doi:10.1016/0304-8853(87)90009-6

Cited by 11 publications

(6 citation statements)

References 5 publications

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“…Extrapolation of M versus 1/ H allows estimating the magnetization at saturation. It is 20 emu/g, while the bulk value of nickel metal is 56 emu/g . These results clearly indicate a ferromagnetic behavior of the nanoparticles in sample A, which could only be due to the presence of nickel metal as nickel boride is not ferromagnetic .…”

Section: Resultsmentioning

confidence: 71%

“…It is 20 emu/g, while the bulk value of nickel metal is 56 emu/g . These results clearly indicate a ferromagnetic behavior of the nanoparticles in sample A, which could only be due to the presence of nickel metal as nickel boride is not ferromagnetic . The high value of the anisotropy constant compared to the bulk is probably due to the very small size of the metal nickel domain in the particle.…”

Section: Resultsmentioning

confidence: 76%

“…This behavior is characteristic of superparamagnetic particles: Below T b , the particles are “blocked” and are in a ferromagnetic state with an irreversible magnetization, whereas above T b the magnetization is reversible and the particles are characterized by superparamagnetic behavior. , From the blocking temperature, T b , and for a particle of average volume V , the anisotropy energy constant, K a , is given by eq 1: For 5.3 nm diameter particles with T b = 10 K, K a is 2.5 × 10 5 erg/cm 3 . For nickel metal, which is weakly anisotropic, a value of 5 × 10 4 erg/cm 3 is reported for bulk metal . Below T b , at 3 K, the particles are ferromagnetic.…”

Section: Resultsmentioning

confidence: 95%

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Synthesis and XPS Characterization of Nickel Boride Nanoparticles

et al. 2002

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Functionalized AOT reverse micelles (Ni(AOT)2/Na(AOT)) were used in an attempt to form nickel metal nanoparticles. After reduction by sodium borohydride either under nitrogen or in open air, nanoparticles are obtained. However, it is shown by X-ray photoelectron spectroscopy analysis that Ni2B is obtained under nitrogen and a mixture of nickel metal and Ni−B is obtained in open air. The magnetic properties of the samples made in open air or under nitrogen drastically differ and confirm the XPS studies.

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Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 95%

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Synthesis and XPS Characterization of Nickel Boride Nanoparticles

et al. 2002

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“…From comparison, it could be seen that the nanoparticles with bigger core diameter possessed higher Ms value, which could be ascribe to the bigger volume of the Ni cores. However, the Ms of these nanoparticles were dramatically lower than that of bulk nickel (55 emu/g [37]). …”

Section: Resultsmentioning

confidence: 86%

Nanometre Ni and core/shell Ni/Au nanoparticles with controllable dimensions synthesized in reverse microemulsion

Chen

Liu

et al. 2009

Journal of Alloys and Compounds

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“…For 7.5 nm diameter magnetic nanoparticles (the average diameter of the Ni cores synthesized in this work) with T B = 16 K, K a = 10.48 × 10 3 J/m 3 . For nickel with weakly anisotropic, a value of 5 × 10 3 J/m 3 is reported for bulk metal . The high value of the anisotropy constant compared to the bulk is probably due to the very small size of the metal nickel domain in the particle.…”

Section: Resultsmentioning

confidence: 98%

Properties of Core−Shell Ni−Au Nanoparticles Synthesized through a Redox-Transmetalation Method in Reverse Microemulsion

et al. 2007

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Core-shell Ni-Au nanoparticles were chemically synthesized through a redox-transmetalation method in reverse microemulsion. The powder X-ray diffraction patterns revealed the presence of crystalline gold and nickel and the absence of any nickel oxides, nickel boride or other byproducts. The core-shell structure could be clearly observed by the transmission electron microscope. In addition, the Ni cores and the gold shells were further verified by the high-resolution transmission electron microscope and the Z-contrast image. The diameter of the nanoparticles ranged from 15 to 30 nm, with 5-10 nm core diameters and 5-10 nm shell thickness. The UV-visible absorption spectra of these nanoparticles showed a red shift (relative to pure gold nanoparticles), also in agreement with the gold shell morphology. For magnetic properties, the zero-field-cooled and field-cooled temperature dependence of the magnetization indicated the blocking temperature was at 16 K. The magnetization curves carried out at 5 K showed that the saturation magnetization, remanent magnetization, and coercivity at this temperature were 9.0 emu/g, 4.1 emu/g, and 2 kOe, respectively. The magnetization curves at 300 K presented the typical superparamagnetic behavior without any remains of remanent magnetization or coercivity, and the saturation magnetization at this temperature was 0.7 emu/g.

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Effect of particle size on the magnetic properties of NiB

Cited by 11 publications

References 5 publications

Synthesis and XPS Characterization of Nickel Boride Nanoparticles

Synthesis and XPS Characterization of Nickel Boride Nanoparticles

Nanometre Ni and core/shell Ni/Au nanoparticles with controllable dimensions synthesized in reverse microemulsion

Properties of Core−Shell Ni−Au Nanoparticles Synthesized through a Redox-Transmetalation Method in Reverse Microemulsion

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