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Enhanced mass transport in ultrarapidly heated Ni/Si thin-film multilayers
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Image of FIG. 1.
FIG. 1.

Photomicrograph and schematic of nanocalorimeter.

Image of FIG. 2.
FIG. 2.

DSC signal and heater voltage vs time for ramp rate for the multilayer sample.

Image of FIG. 3.
FIG. 3.

DSC signal divided by the scan rate for five scan rates plotted against normalized scan time. Also shown is the normalized applied heater voltage .

Image of FIG. 4.
FIG. 4.

Sum of peak area (enthalpy) vs scan rate for multilayer (circles) and bilayer (solid triangles). Inset: peak 1 enthalpy (diamonds), peak 2 enthalpy (squares), and sum of peak areas (circles) vs scan rate for multilayer sample.

Image of FIG. 5.
FIG. 5.

TEM images from Ni/Si multilayer sample annealed with a ramp rate of (a) and [(b)–(e)] . (c) Magnified brightfield image. [(d) and (e)] EFTEM maps for Si and Ni from the same area.

Image of FIG. 6.
FIG. 6.

(a) Calculated Ni–Si equilibrium phase diagram. (b) Diagram assuming metastable equilibria among the pure Ni and Si end members and the liquid phase. (c) Metastable equilibria among Ni solid solution, Si, ordered fcc phase, and liquid. (d) Metastable equilibria among pure Ni and Si end members, , , and liquid.

Image of FIG. 7.
FIG. 7.

Diffusion profile calculated with D(gb) for . Solid line represents calculation for a scan, and dashed line is for a scan. is the ratio of the Ni concentration after a temperature scan to the concentration before the scan.


Generic image for table
Table I.

Relevant diffusivities at .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Enhanced mass transport in ultrarapidly heated Ni/Si thin-film multilayers