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Ni(3)Si(Al)/a-SiO(x) core-shell nanoparticles: characterization, shell formation, and stability.

G Pigozzi¹, D Mukherji, R Gilles

¹ETH Zurich, Institute of Applied Physics, CH-8093, Zürich, Switzerland.

|July 6, 2011

Summary

Researchers extracted Ni(3)Si-type nanoprecipitates using electrochemistry. These nanoparticles exhibit a core-shell structure with an amorphous silica shell forming during extraction, which transforms upon annealing.

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Area of Science:

Materials Science
Metallurgy
Nanotechnology

Background:

Nickel-silicon (Ni-Si) and Nickel-silicon-aluminum (Ni-Si-Al) alloys are crucial in various industrial applications.
Understanding the behavior of intermetallic phases at the nanoscale is essential for material design.
Nanoprecipitates significantly influence alloy properties, necessitating advanced characterization techniques.

Purpose of the Study:

To extract and characterize nanoprecipitates of the Ni(3)Si-type intermetallic phase from Ni-Si and Ni-Si-Al alloys.
To investigate the structure and composition of these extracted nanoparticles.
To explore the formation mechanism of the observed core-shell structure and the effect of annealing on the nanoparticles.

Main Methods:

Electrochemical selective phase dissolution to isolate nanoprecipitates.

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Transmission electron microscopy (TEM) for structural and morphological analysis.

Energy-dispersive X-ray spectrometry (EDS) for elemental composition.

X-ray powder diffraction (XRD) and electron powder diffraction (EPD) for phase identification.

Main Results:

Successfully extracted Ni(3)Si-type nanoprecipitates.
Identified a core-shell structure: a crystalline Ni(3)Si core and an amorphous silicon oxide (SiO(x)) shell.
Observed recrystallization of the tridymite phase within the shell after annealing in nitrogen at 700°C.
Found no structural or compositional changes after annealing in air at 1000°C.

Conclusions:

The amorphous SiO(x) shell forms during the electrochemical extraction process due to silicon migration.
The core-shell structure's stability is influenced by annealing atmosphere and temperature.
This study provides insights into nanoscale precipitate behavior and extraction methodologies for advanced materials.