Photomicrograph and schematic of nanocalorimeter.
DSC signal and heater voltage vs time for ramp rate for the multilayer sample.
DSC signal divided by the scan rate for five scan rates plotted against normalized scan time. Also shown is the normalized applied heater voltage .
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.
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.
(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.
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.
Relevant diffusivities at .
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