Melting and Structural Dynamics of Indium Nanoparticles Embedded in Aluminum

Zhang, Yueli; Xiong, Hui; Elsayled-Ali, Hani E.

doi:10.1021/acs.jpcc.0c04950

Cited by 10 publications

(8 citation statements)

References 46 publications

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“…Therefore, the sample is placed on a thermally heated stage to raise the sample temperature closer to T m , followed by ultrafast laser heating to further heat the NPs to a maximum transient temperature. This method was used in previous time-resolved electron diffraction studies of melting. − , By increasing the sample temperature on a hot stage, the laser fluence required for melting becomes smaller, which also limits nonthermal effects on structural phase transitions. In our experiment, the laser heating fluence was set at 1.05 mJ/cm 2 and the base temperature was slowly raised at a rate of ∼1 K/min.…”

Section: Resultsmentioning

confidence: 99%

“…Superheating of embedded NPs and thin films was observed in a number of metallic systems, such as Pb/Al and In/Al. − The elevated melting point is due to suppression of the heterogeneous nucleation of melting at the NP–matrix interface. Only a few superheating results with ultrafast heating were reported so far. − Indium NPs embedded in aluminum were superheated by 1.15–1.45 T m , using an ultrafast laser to achieve a heating rate of ∼10 15 K/s.…”

Section: Introductionmentioning

confidence: 99%

“…Only a few superheating results with ultrafast heating were reported so far. 26−28 Indium NPs embedded in aluminum were superheated by 1.15−1.45 T m , 37 using an ultrafast laser to achieve a heating rate of ∼10 15 K/s.…”

Section: Introductionmentioning

confidence: 99%

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Observation of Bismuth Nanoparticle Premelting by Slow and Ultrafast Laser Heating

et al. 2022

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The melting of Bi nanoparticles (NPs), prepared by thermal evaporation, was studied by electron diffraction for slow thermal heating and for ultrafast laser heating. For thermal heating at a rate of ∼1 K/min, the onset of melting of the NPs was at ∼44 K below the Bi bulk melting point, T m . Lattice contraction was observed as the NPs were heated near their melting point. For ultrafast heating with a 800 nm, 110 fs laser pulse at a rate of ∼10 15 K/s, the melting point of the NPs was almost similar to that for slow heating, showing no evidence of superheating. This result differs from that of previous observations of superheating of Bi and is attributed to the rounded shape of the Bi NPs which are bounded by surfaces that melt below or at T m . The dependence of the diffraction intensity on temperature for the (110) order gives a larger slope for laser heating compared to thermal heating. This observation reflects the difference in the meansquare atomic displacement between thermal and laser heating as a result of the generation of directional-dependent coherent acoustic phonons from the decay of laser-excited optical phonons.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Observation of Bismuth Nanoparticle Premelting by Slow and Ultrafast Laser Heating

et al. 2022

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“…Like most metals, In has a positive Hamaker constant, which is normally associated with crystals with surfaces that premelt and undergo positive volume change upon melting, as is the case for most elements. [38] For In nanocrystals that are embedded in an Al matrix, increased melting temperatures were observed for cases when a specific orientation relationship between the particles and the matrix was obeyed (i.e., {111} Al || {111} In and 〈110〉 Al || 〈110〉 In). Excess energy minimization thus leads to particle shapes where In forms truncated octahedrons bounded by {111} Al and {100} Al [21,32].…”

Section: Pb and In Nanoparticles Embedded In Polycrystalline Almentioning

confidence: 99%

Structural Phase Transformations in Nanoscale Systems

Wilde

2021

Adv Eng Mater

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As characteristic size scales of materials systems tend to progressively become shorter, size‐dependent materials’ behavior becomes increasingly important. Related to many aspects concerning stability, function, and performance are phase transformations that might be necessary to obtain a specific state or are necessary to avoid to retain a specific phase or state with desired properties. At dimensions in the range of tens nanometers or below, size effects affect structural phase transformations significantly. Opinions and models about the origin of the size‐dependence abound since several decades. However, more recent results allow analyzing the local atomic structure of the particle/matrix interfaces as well as local strain contributions in detail. In addition, size‐dependent measurements of excess thermodynamic potentials can be carried out and rate‐dependent analyses explore new regimes at significantly enhanced heating rates. These recent results serve to estimate the relative importance of kinetic and different thermodynamic contributions. Herein, the emphasis is on summarizing the recent progress that is made on the size effect and on the impact of the interfacial structure on the melting transformation of embedded nanoparticles. At the same time, these results serve to considerably enhance the understanding of the melting process in general.

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“…Nonetheless, a solid with an open surface can be superheated in particular experiments at appropriate conditions [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ], for example, during rapid heating of a solid throughout its volume and simultaneous cooling of its surface to suppress surface melting [ 20 , 30 ]. Superheating can be obtained in tiny crystalline clusters inserted into a proper medium with a higher melting temperature by their subsequent laser heating [ 22 , 25 , 26 , 29 ]. Depending on the coating material, either volume or surface nucleation might be favored [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Planar Interfaces on Nucleation in Melting and Crystallization

Schmelzer

Tipeev

2022

Entropy

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The effect of planar interfaces on nucleation (namely, on the work of critical cluster formation and their shape) is studied both for crystallization and melting. Advancing an approach formulated about 150 years ago by J. W. Gibbs for liquid phase formation at planar liquid–liquid interfaces, we show that nucleation of liquids in the crystal at crystal–vapor planar interfaces proceeds as a rule with a much higher rate compared to nucleation in the bulk of the crystal. Provided the surface tensions crystal–liquid (σcl), liquid–vapor (σlv), and crystal–vapor (σcv) obey the condition σcv=σcl+σlv, the work of critical cluster formation tends to zero; in the range σcv<σcl+σlv, it is less than one half of the work of critical cluster formation for bulk nucleation. The existence of a liquid–vapor planar interface modifies the work of critical cluster formation in crystal nucleation in liquids to a much less significant degree. The work of critical crystal cluster formation is larger than one half of the bulk value of the work of critical cluster formation, reaching this limit at σcv=σcl+σlv. The shape of the critical clusters can be described in both cases by spherical caps with a radius, R, and a width parameter, h. This parameter, h, is the distance from the cutting plane (coinciding with the crystal–vapor and liquid–vapor planar interface, respectively) to the top of the spherical cap. It varies for nucleation of a liquid in a crystal in the range (h/R)≤1 and for crystal nucleation in a liquid in the range 2≥(h/R)≥1. At σcv=σcl+σlv, the ratio (h/R) of the critical cluster for nucleation in melting tends to zero ((h/R)→0). At the same condition, the critical crystallite has the shape of a sphere located tangentially to the liquid–vapor interface inside the liquid ((h/R)≅2). We present experimental data which confirm the results of the theoretical analysis, and potential further developments of the theoretical approach developed here are anticipated.

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Melting and Structural Dynamics of Indium Nanoparticles Embedded in Aluminum

Cited by 10 publications

References 46 publications

Observation of Bismuth Nanoparticle Premelting by Slow and Ultrafast Laser Heating

Observation of Bismuth Nanoparticle Premelting by Slow and Ultrafast Laser Heating

Structural Phase Transformations in Nanoscale Systems

Effect of Planar Interfaces on Nucleation in Melting and Crystallization

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