Thermal stability of Fe, Co, Ni metal nanoparticles

Cao, Lingfei; Gong, Xu; Xie, Dan; Guo, Mingxia; Luo, Li; Li, Z; Wang, M P

doi:10.1002/pssb.200642014

Cited by 30 publications

(17 citation statements)

References 39 publications

(30 reference statements)

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“…The role of vacancies as the major defects in metal nanoparticles may be significant because a vast number of vacancies are highly likely to be supersaturated in the metal nanoparticles during their preparation processes [15,33]. In this respect, vacancy migration will in general have little to do with microstructure evolution such as grain growth.…”

Section: Exponential Decay Characteristics Of Electrical Resistivitymentioning

confidence: 97%

Characteristics of microstructure and electrical resistivity of inkjet-printed nanoparticle silver films annealed under ambient air

Jung¹,

Choi²,

Kim³

et al. 2008

Philosophical Magazine

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The microstructure and electrical resistivity of inkjet-printed silver (Ag) films annealed under ambient air were characterized. Analyses of the impurity amounts in the films using secondary-ion mass spectrometry showed that the decomposition temperature of the capping molecules was just below 170 C. Both the characteristics of the microstructure and electrical resistivity when annealed at low temperatures (lower than the decomposition temperature) were significantly different from those when annealed at high temperatures. The results show that neither microstructural features, such as grain size, nor the amounts of impurities can explain both the magnitude and characteristic decrease in electrical resistivity. The changes in electrical resistivity can be described using exponential decay kinetics. The corresponding activation energy of 0.44 eV when annealed at the high temperatures is explained by the migration of point defects such as vacancy-oxygen pairs. On the other hand, negligible dependence on temperature was identified when annealed at low temperatures, which was attributed to decomposition of the capping molecules. The results indicate the importance of controlling the defects of nanoparticles and the properties of capping molecules from the viewpoint of electrical optimization of metallization fabricated using inkjet printing.

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Section: Exponential Decay Characteristics Of Electrical Resistivitymentioning

confidence: 97%

Characteristics of microstructure and electrical resistivity of inkjet-printed nanoparticle silver films annealed under ambient air

Jung¹,

Choi²,

Kim³

et al. 2008

Philosophical Magazine

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show abstract

“…The shape is more often spherical, cylindrical and plate-like. Cao et al [37] have investigated the thermal stability of Fe, Co, Ni metal nanoparticles using a simplified thermodynamic model covering both size and shape effects. The effects of the shape of magnetic particles on the coercive field is studied by Ott et al [38].…”

Section: Resultsmentioning

confidence: 99%

Composition dependence of the coercivity in magnetic nanoparticles suitable for magnetic hyperthermia

Apostolova

Wesselinowa

2009

Physica Status Solidi (b)

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Based on the Heisenberg model including single‐site uniaxial anisotropy and using a Green's function technique we have studied the influence of size, shape and composition effects on the coercive field Hc saturation magnetization Ms and Curie temperature Tc of ferromagnetic nanoparticles. We have discussed various possibilities which could lead to decreasing of Hc and Tc and increasing of Ms It is shown that spherical Ni–Pd, Fe–Pt and Zn–Co‐ferrite nanoparticles with d ≈ 10 nm are suitable for magnetic hyperthermia applications. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…6 Critical temperature dependence on the inverse of the nanoparticle diameter toward lower temperatures for the surface contribution of the susceptibility is related to the cohesive energy E C . The cohesive energy equals the energy needed to destroy all bonds when dividing the crystal into isolated atoms and is directly determined by the product of the bond amount (CN) and its unit energy [26,27]. Then, the lower Curie temperature is related to the decrease of atomic cohesive energy that is caused by the lower coordination number (CN) at the surface.…”

Section: Results and Analysismentioning

confidence: 99%

Stoichiometry Dependence on the Diameter of La2/3Ca1/3MnO3 Manganite Nanoparticles

Orozco-Hernández

Rojas

2012

J Supercond Nov Magn

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This study presents the magnetic properties of manganite fine particles using Monte Carlo simulations in the framework of a core-shell model. A single-spin movement Metropolis dynamics was implemented to compute equilibrium averages. Calculations were performed on the basis of a three-dimensional classical Heisenberg Hamiltonian, involving the presence of Mn 3+ (Mn 3+e g and Mn 3+e g ) and Mn 4+ (Mn 4+d 3 ) cations, and their nearest neighbor interaction. The Hamiltonian includes a surface anisotropy term applied to surface ions, and cubic anisotropy for ions belonging to the core. Different diameters were considered in order to figure out different off-stoichiometric scenarios and the influence on the magnetic properties. Results reveal a well-defined linear particle size inverse dependence of the Curie temperature. No evidence for surface spin disorder was detected. Finally, susceptibility data reveal that the ferromagnetic-to-paramagnetic transition occurs in a gradual fashion ascribed to a differentiated behavior between the core and surface. Initially, the surface contribution to magnetic properties is high; as the nanoparticle size increases, the core contribution becomes stronger.

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Thermal stability of Fe, Co, Ni metal nanoparticles

Cited by 30 publications

References 39 publications

Characteristics of microstructure and electrical resistivity of inkjet-printed nanoparticle silver films annealed under ambient air

Characteristics of microstructure and electrical resistivity of inkjet-printed nanoparticle silver films annealed under ambient air

Composition dependence of the coercivity in magnetic nanoparticles suitable for magnetic hyperthermia

Stoichiometry Dependence on the Diameter of La2/3Ca1/3MnO3 Manganite Nanoparticles

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