Disordering of platinum clusters

Contrata, W.; Mitchell, M. J.; Mochel, J. M.

doi:10.1016/0304-3991(93)90104-6

Cited by 11 publications

(7 citation statements)

References 12 publications

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“…Structural changes related to twin movement occur in a few seconds. This behaviour is similar to the one already observed in other small metallic particles [14][15][16].…”

supporting

confidence: 90%

Spontaneous Phase Fluctuations of Nanoparticles of Lead in a Silicon Oxide Matrix

Stella¹,

Migliori²,

Cheyssac³

et al. 1994

Europhys. Lett.

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We present room temperature high-resolution electron microscopy (HREM) data and optical-reflectivity results at A = 0.6 pn in the temperature range 300-600 K on Pb particles, having dimensions from 15 down to 3 nm and embedded in a matrix of amorphous SiO. HREM gives a clear indication of three different size-dependent regimes for the particles, which are interpreted in terms of spontaneous phase fluctuations occurring for diameters in the range -10-5 nm, where the reflectivity rise typical of the solid-liquid transition is shown to undergo a progressive decrease.

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“…Structural changes related to twin movement occur in a few seconds. This behaviour is similar to the one already observed in other small metallic particles [14][15][16].…”

supporting

confidence: 90%

Spontaneous Phase Fluctuations of Nanoparticles of Lead in a Silicon Oxide Matrix

Stella¹,

Migliori²,

Cheyssac³

et al. 1994

Europhys. Lett.

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“…36 Contrata et al bombarded silica-supported platinum clusters of less than 4 nm diameter with electrons from a scanning tunnelling electron microscope. 37 After bombardment, the clusters were disordered and remained amorphous for up to 24 hours. This proves that amorphous Pt clusters can exist under certain experimental conditions, though they may not necessarily be GM.…”

Section: Platinum and Palladium Catalystsmentioning

confidence: 99%

Geometries and segregation properties of platinum–palladium nanoalloy clusters

Massen

Mortimer-Jones

Johnston

2002

J. Chem. Soc., Dalton Trans.

130

133

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“…Experimentally, the structure of Pt n clusters with n ≤ 200 is still unclear: for clusters with diameter >10 nm or even ∼2 nm crystalline geometries seem to be preferred, but other structural forms might be favorite for smaller aggregates …”

Section: Introductionmentioning

confidence: 99%

Density-Functional Calculations on Platinum Nanoclusters: Pt₁₃, Pt₃₈, and Pt₅₅

2003

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The results of an accurate density-functional study of the structure, energetics and electronic structure of Pt n clusters (with n = 13, 38, and 55) are presented. For Pt38, a truncated octahedral geometry is considered; for Pt13 and Pt55, icosahedral, truncated decahedral, and cuboctahedral geometries are considered. In each case, the structure of the neutral and positively and negatively charged clusters is fully optimized within the given symmetry group. For Pt13, allowing symmetry breaking starting from the symmetrical structures derives additional local minima. The computational procedure is thoroughly tested to keep numerical accuracy under control. From the electronic structure point of view, it is found that these systems start developing metallic characteristics, with ionization introducing small changes. From the structural point of view, for Pt13 the icosahedral configuration is not favored, whereas it becomes the ground state for Pt55, in agreement with the predictions of atom−atom potentials. Moreover, the lowest energy configuration of Pt13 is a symmetry-broken D 4 h one, while for Pt38 and Pt55 a peculiar rearrangement is found, corresponding to an expansion (reconstruction) of the atoms lying on (111) or (100) faces.

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Disordering of platinum clusters

Cited by 11 publications

References 12 publications

Spontaneous Phase Fluctuations of Nanoparticles of Lead in a Silicon Oxide Matrix

Spontaneous Phase Fluctuations of Nanoparticles of Lead in a Silicon Oxide Matrix

Geometries and segregation properties of platinum–palladium nanoalloy clusters

Density-Functional Calculations on Platinum Nanoclusters: Pt₁₃, Pt₃₈, and Pt₅₅

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Disordering of platinum clusters

Cited by 11 publications

References 12 publications

Spontaneous Phase Fluctuations of Nanoparticles of Lead in a Silicon Oxide Matrix

Spontaneous Phase Fluctuations of Nanoparticles of Lead in a Silicon Oxide Matrix

Geometries and segregation properties of platinum–palladium nanoalloy clusters

Density-Functional Calculations on Platinum Nanoclusters: Pt13, Pt38, and Pt55

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Product

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Density-Functional Calculations on Platinum Nanoclusters: Pt₁₃, Pt₃₈, and Pt₅₅