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Studies of atomic diffusion in Ni-Pt solid solution by x-ray photon correlation spectroscopy.

Markus Stana¹, Michael Leitner, Manuel Ross

¹Universität Wien, Fakultät für Physik, Vienna, Austria. markus.stana@univie.ac.at

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|January 15, 2013

Summary

Atomic scale x-ray photon correlation spectroscopy (aXPCS) revealed atomic diffusion in Ni(97)Pt(3) solid solutions. This technique sensitively probes short-range order, yielding activation energy and diffusivities consistent with higher-temperature studies.

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Area of Science:

Materials Science
Solid-State Physics
Physical Chemistry

Background:

Understanding atomic diffusion mechanisms is crucial for materials performance and development.
Nickel-platinum (Ni-Pt) solid solutions are technologically relevant alloys.
Previous studies often relied on higher-temperature diffusion measurements.

Purpose of the Study:

To investigate atomic diffusion at the atomic scale in Ni(97)Pt(3) using aXPCS.
To explore the influence of short-range order on diffusion dynamics.
To compare aXPCS findings with established diffusion models and higher-temperature data.

Main Methods:

Utilized atomic scale x-ray photon correlation spectroscopy (aXPCS) on single crystal and polycrystalline Ni(97)Pt(3) samples.
Employed Monte Carlo simulations to analyze experimental results and test diffusion models.
Investigated the role of short-range order, specifically the Pt-Pt repulsive force.

Main Results:

Demonstrated the high sensitivity of aXPCS to short-range order effects in Ni(97)Pt(3).
Determined an activation energy of 2.93(10) eV for atomic diffusion.
Measured diffusivities of approximately 10(-23) m(2) s(-1) at 830 K.

Conclusions:

aXPCS is a powerful tool for studying atomic diffusion and short-range order at low temperatures.
The determined diffusion parameters align well with tracer diffusion results obtained at significantly higher temperatures.
The findings provide atomic-level insights into diffusion in Ni-Pt alloys, validating the employed models.