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Related Experiment Video

Updated: Apr 19, 2026

A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction

A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction

Published on: January 26, 2016

Oxidation-driven surface dynamics on NiAl(100).

Hailang Qin¹, Xidong Chen², Liang Li¹

¹Department of Mechanical Engineering & Multidisciplinary Program in Materials Science and Engineering, State University of New York, Binghamton, NY 13902;

Proceedings of the National Academy of Sciences of the United States of America

|December 31, 2014

Summary

Surface steps act as barriers to oxide film growth on NiAl(100), impeding the process. This discovery reveals critical insights into surface dynamics and atomic transport during oxidation and decomposition.

Keywords:

NiAl oxidation surface steps

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Published on: February 19, 2018

Area of Science:

Materials Science
Surface Science
Physical Chemistry

Background:

Atomic steps are inherent defects on crystal surfaces influencing physical and chemical processes.
Predicting surface dynamics under nonequilibrium conditions is challenging due to limited understanding of step-related mass transport.

Purpose of the Study:

To investigate the role of atomic steps in oxide film growth dynamics.
To elucidate the mechanisms of surface motion and mass transport during oxidation and decomposition of NiAl(100).

Main Methods:

Utilized low-energy electron microscopy (LEEM) for spatially and temporally resolved observation.
Studied the oxidation of NiAl(100) single crystal surfaces.

Main Results:

Demonstrated that surface steps are impermeable to oxide film growth on NiAl(100).
Observed that oxide advancement occurs on terraces, driven by coordinated step migration.
Found that step accumulation ahead of the growth front impedes oxidation, a process reversed during decomposition.
Modeled substrate step migration as a Hele-Shaw problem, involving Al atom detachment/attachment at step edges.

Conclusions:

Oxidation rate is limited by surface step behavior when steps supply atoms.
When atoms originate from the bulk, oxidation is not limited by surface step motion.
The findings provide a new understanding of surface-controlled oxidation kinetics.