Observation of quasimelting at the atomic level in Au nanoclusters

Krakow, William; José–Yacamán, Miguel; Aragón, J. L.

doi:10.1103/physrevb.49.10591

Cited by 50 publications

(43 citation statements)

References 19 publications

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“…Other nanoparticles have presented these fluctuations when they are exposed to the electron beam, as was reported by W. Krakow et al 20 . This suggest that, if the nanoparticles are in the martensitic phase, the electron beam could induce the phase transformation to a more stable phase (austenite) by increasing the nanoparticles temperature during its observation, being the origin of the instabilities observed during TEM analysis of the nanoparticles.…”

Section: Characterization Of Nanoparticles From Sample a With An Ms Osupporting

confidence: 52%

Nanoparticles from Cu-Zn-Al shape memory alloys physically synthesized by ion milling deposition

et al. 2012

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In this research, an ion milling equipment was used to elaborate nanoparticles from Cu-Zn-Al alloys with shape memory effect. Two different compositions were used, target A: 75.22Cu-17.12Zn-7.66Al at % with an Ms of -9 °C and target B: 76.18Cu-15.84Zn-7.98Al with an Ms of 20 °C. Nanoparticles were characterized by High Resolution Transmission Electron Microscopy, Electron Diffraction and Energy Dispersive X-ray Spectroscopy. The obtained nanoparticles showed a small dispersion, with a size range of 3.2-3.5 nm. Their crystal structure is in good agreement with the bulk martensitic structure of the targets. In this sense, results on morphology, composition and crystal structure have indicated that it is possible to produce nanoparticles of CuZnAl shape memory alloys with martensitic structure in a single process using Ion Milling.

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Section: Characterization Of Nanoparticles From Sample a With An Ms Osupporting

confidence: 52%

Nanoparticles from Cu-Zn-Al shape memory alloys physically synthesized by ion milling deposition

et al. 2012

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“…166) [12], with a 1 =a 2 =a 3 =4.745 Å and α=57.24°, with two atoms in a unit cell, one at the origin (0,0,0) and one on the major diagonal [7]. This is essentially different from FCC elements, such as Au and Pb, studied in the past [1][2][3][4][5][6].…”

Section: Experimental Set-upmentioning

confidence: 99%

“…Nanoparticles are now known for their spontaneous crystallographic rearrangements that take place even way below their melting point [1][2][3][4][5][6][7][8]. Recently, we have quantitatively shown [7] that the crystallographic rearrangement (also known as rotations, but not rigid body rotations that simply change the character of the diffraction contrast) of Bi nanoparticles is thermally activated and occurs by plane-after-plane gliding.…”

Section: Introductionmentioning

confidence: 99%

Discrete angle rotations of Bi nanoparticles embedded in a Ga matrix

Be’er¹,

Kofman²,

Lereah³

2009

Open Physics

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Abstract:Spontaneous instabilities of nanoparticles are known to be influenced by the temperature, and strongly depend on the particle size. However, it is not clear what is the role of the surrounding material that is in contact with the particle. Here we report on the difference between spontaneous rotations of Bi nanoparticles embedded in amorphous SiO and those embedded in liquid Ga. The phenomenon was studied quantitatively by time resolved transmission electron microscopy using Fourier Transform analysis of highresolution electron microscopy images. While rotations of Bi nanoparticles embedded in amorphous SiO occur by all angles, the rotations of Bi nanoparticles embedded in liquid Ga occur by discrete angles. Our results point quantitatively, for the first time, to the role and importance of the contacting surrounding surface during the rotation of nanoparticles.

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“…When the quantum effects are dominant and it is better to call a group of atoms a nanocluster or a super-atom and when the plasmonic effect starts to appear, we can call them nanoparticles produced which results in many configuration results. Since the energy differences are so small, at room temperature, we will expect fluctuations on the shape [33][34][35]. This phenomenon is known as quasimelting [36], and it is illustrated in Fig.…”

Section: Difference Between Clusters and Nanoparticlesmentioning

confidence: 99%

“…1 44 , and several others. A new trend has been to produce bimetallic clusters such as of Au-Ag [33,34].…”

Section: Difference Between Clusters and Nanoparticlesmentioning

confidence: 99%