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Atomic Dynamics of Multi-Interfacial Migration and Transformations.

Xianhu Sun1, Dongxiang Wu1, Wissam A Saidi2

  • 1Department of Mechanical Engineering & Materials Science and Engineering Program, State University of New York, Binghamton, NY, 13902, USA.

Small (Weinheim an Der Bergstrasse, Germany)
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Summary
This summary is machine-generated.

Researchers reveal atomic-scale dynamics of copper oxide (CuO) reduction, detailing phase transformations and interfacial reactions. This study illuminates how surface reactions and oxygen vacancy diffusion drive multi-interface evolution in metal oxides.

Keywords:
in situ transmission electron microscopy (TEM)interfacekineticsoxide reductionphase transformation

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Redox reactions in metal oxides create multiple phase boundaries, complicating atomic-scale analysis.
  • Simultaneously resolving multiple reaction fronts during oxide transformations is experimentally challenging.

Purpose of the Study:

  • To demonstrate and atomically resolve the reaction pathway of copper oxide (CuO) reduction in hydrogen gas.
  • To investigate the mechanisms controlling interfacial transformations during multi-oxide phase evolution.
  • To elucidate the role of surface reactions and mass transport in subsurface and bulk phase changes.

Main Methods:

  • Atomic-scale in-situ observation of CuO reduction to monoclinic m-Cu4O3 and then to Cu2O.
  • Identification and characterization of interfacial reaction fronts, including diffuse and ledge-flow mechanisms.
  • Atomistic modeling to understand the role of oxygen vacancies and surface-reaction-induced transformations.

Main Results:

  • The reduction pathway CuO → m-Cu4O3 → Cu2O was atomically resolved, revealing distinct interfacial behaviors.
  • The Cu2O/m-Cu4O3 interface exhibited a diffuse transformation, while the m-Cu4O3/CuO interface involved lateral ledge flow.
  • Oxygen vacancy formation and diffusion from the surface were identified as key drivers for lower oxide formation and interfacial transformations.

Conclusions:

  • The study demonstrates dynamic atomic processes at multiple reaction fronts during metal oxide reduction.
  • Understanding the interplay between surface reaction dynamics, mass transport, and phase evolution is crucial for controlling microstructures.
  • These findings have significant implications for designing and manipulating interphase boundaries in catalytic and electronic materials.