Phase transition from the ferromagnetic to superparamagnetic with a loop shift in 5-nm nickel particles

Liu, Xiansong; Huang, Kai; Zhou, Shengqiang; Zhao, Peng; Meridor, Udi; Frydman, A.; Gedanken, Aharon

doi:10.1016/j.jmmm.2006.02.091

Cited by 16 publications

(17 citation statements)

References 32 publications

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“…Liu et al [49] reported a value of 100 K. Near the phase transition temperature, the FC M(T) dependencies demonstrate slope changing [49]. We observed a similar behavior in studied samples at a temperature of 70 K; however, in contrast to [49], we evaluated our measurements at low field, significantly lower than the saturation field, so in our case, this change in slope is substantially diffused. We can conclude that Ni@C particles demonstrate superparamagnetic properties at room temperature, which is confirmed by the behavior of the ZFC and FC curves.…”

Section: Magnetic Propertiessupporting

confidence: 67%

“…The weak diamagnetic effect of the 7 vol % Ni@C composite at high fields (see Figure 6, inset) is related to the diamagnetic properties of the polymer [47]. The dependence of magnetization is governed by Langevin's law (Figure 6 (solid lines)): The field dependence is typical for composites with superparamagnetic particles [48][49][50]. The temperature dependences of magnetization were measured in two modes: (i) the sample was cooled under an external magnetic field with a small value of 17 mT, the field cooling (FC), and (ii) the sample was previously cooled without an external field, a field of 17 mT was then switched on, and the magnetization of sample was measured upon heating, the zero field curve (ZFC).…”

Section: Magnetic Propertiesmentioning

confidence: 98%

“…It is known that Ni particles with a 5 nm diameter demonstrate a phase transition to ferromagnetic phases in the studied temperature range [48]. Liu et al [49] reported a value of 100 K. Near the phase transition temperature, the FC M(T) dependencies demonstrate slope changing [49]. We observed a similar behavior in studied samples at a temperature of 70 K; however, in contrast to [49], we evaluated our measurements at low field, significantly lower than the saturation field, so in our case, this change in slope is substantially diffused.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

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Carbon-Coated Nickel Nanoparticles: Effect on the Magnetic and Electric Properties of Composite Materials

et al. 2018

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Nickel nanoparticles coated with few layers of carbon have been embedded into the polydimethylsiloxane (PDMS) matrix in concentrations up to 11 vol %. Dielectric and magnetic properties of composite materials have been studied in wide frequency (20 Hz-1 MHz) and temperature (130-430 K) ranges. It was demonstrated that the temperature behavior of dielectric properties is determined by glass transitions in the PDSM matrix below 200 K and the Maxwell-Wagner relaxation above room temperature. The possibility of using fabricated composites on the basis of the PDMS matrix for producing a wide range of passive electromagnetic components, such as frequency-selective filters, wide-band detectors/sensors of a bolometric type, and even electromagnetic "black holes" is also discussed.

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Section: Magnetic Propertiessupporting

confidence: 67%

Section: Magnetic Propertiesmentioning

confidence: 98%

Section: Magnetic Propertiesmentioning

confidence: 99%

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Carbon-Coated Nickel Nanoparticles: Effect on the Magnetic and Electric Properties of Composite Materials

et al. 2018

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“…We can see that the walls were smooth, the length of hollow carbon nanotubes was of the order of micron, the diameters of most of the CNTs were about 18-20 nm according to the TEM images and the largest nanotube with a diameter of 40 nm could be also clearly seen. Similar to previous experiments [17][18][19], no CNTs without a small electric spark could be observed. So the small electric spark was an important condition to the synthesis of CNTs.…”

Section: Morphology Characteristics Of Cntssupporting

confidence: 91%

“…The main reactor was shown in Figure 1, which included three main parts: a microwave oven, a flask, and a condenser tube. Similar to previous work [17][18][19], before the reaction, 50 mL of a solution of 0.125 M (or 0.250 M) Ni(Ac) 2 in ethylene glycol was prepared in a 100 mL glass flask.…”

Section: Preparation For Mwcntsmentioning

confidence: 99%

One-step preparation of carbon nanotubes with nickel as the core

Zheng

Liu

et al. 2010

Sci. China Technol. Sci.

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CNTs with core-shell structure were successfully synthesized by a microwave-assisted polyol method, and magnetic Ni nanoparticles were employed as a catalyst. The preparation method is fast and simple. The structures, morphology and magnetic properties of the as-synthesized samples were investigated using Raman spectrometer, X-ray diffraction (XRD), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), respectively. The XRD results suggested that Ni particles used as a catalyst in our experiment were nano-sized. In this paper, magnetic Ni nanoparticles were employed as a catalyst, and an electric spark on metal Ni nanoparticles with the microwave eddy current effect could induce CNTs' formation with the further reaction. The length of hollow carbon nanotubes was micro-sized and the diameters of most of the CNTs were varying from 18 to 20 nm according to the TEM images. Magnetic measurements demonstrated that CNTs with core-shell structure indicated a characteristic ferromagnetic behavior compared with Ni nanoparticles. microwave-assisted, Ni catalyst, carbon nanotube, core-shell structure Citation:Ruan Z, Liu X S, Hu F, et al. One-step preparation of carbon nanotubes with nickel as the core.

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The Role of Carbon Content: A Comparison of the Nickel Particle Size and Magnetic Property of Nickel/Polysiloxane‐Derived Silicon Oxycarbide

et al. 2023

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A facile and novel processable method to synthesize the Ni nanoparticles (Ni NPs) by tailoring their size in the matrix of the silicon oxycarbide (SiOC) ceramic system is reported. This method is based on polymer‐derived ceramics (PDCs), instead of the conventional powder route. The specific structural characteristics and magnetic properties of the various Ni NPs/SiOC composites as a function of carbon content are systematically investigated. The magnetic properties are experimentally investigated as a function of NP size and measurement temperature. It is demonstrated that the change in the size of Ni NPs (average from ≈4 to ≈ 19 nm) determines the magnetic nature of superparamagnetism. Zero‐field‐cooled (ZFC) and field‐cooled (FC) magnetization studies under magnetic fields of 100 Oe are performed. The saturated M versus H (M–H) loops (saturation magnetization) increase and the coercivity decreases with the size reduction of Ni NPs. It is an indicator of the presence of superparamagnetic behavior and single‐domain NP for ceramic materials.

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Phase transition from the ferromagnetic to superparamagnetic with a loop shift in 5-nm nickel particles

Cited by 16 publications

References 32 publications

Carbon-Coated Nickel Nanoparticles: Effect on the Magnetic and Electric Properties of Composite Materials

Carbon-Coated Nickel Nanoparticles: Effect on the Magnetic and Electric Properties of Composite Materials

One-step preparation of carbon nanotubes with nickel as the core

The Role of Carbon Content: A Comparison of the Nickel Particle Size and Magnetic Property of Nickel/Polysiloxane‐Derived Silicon Oxycarbide

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