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Related Concept Videos

Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
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Related Experiment Video

Updated: Jul 19, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Local structure studies of Fe-Nb-B metallic glasses using electron diffraction.

A Hirata1, Y Hirotsu, T Ohkubo

  • 1The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka, Japan. ahirata@sanken.osaka-u.ac.jp

Journal of Microscopy
|October 25, 2006
PubMed
Summary

Local atomic structures in iron-niobium-boron amorphous alloys were analyzed using electron diffraction. The study reveals these structures resemble crystalline phases, explaining differences in amorphous alloy stability.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Amorphous alloys, particularly iron-niobium-boron (Fe-Nb-B) systems, exhibit unique properties relevant to various industrial applications.
  • Understanding the local atomic structure is crucial for predicting and controlling the stability and behavior of these amorphous materials.

Purpose of the Study:

  • To investigate and compare the local atomic structures of two distinct Fe-Nb-B amorphous alloys: Fe(84)Nb(7)B(9) and Fe(70)Nb(10)B(20).
  • To elucidate the relationship between the atomic structure of amorphous phases and the crystalline phases formed upon annealing.
  • To provide insights into the differing stability of these amorphous alloys based on their structural characteristics.

Main Methods:

  • Utilizing energy-filtered transmission electron microscopy (TEM) to obtain electron diffraction patterns, minimizing interference from inelastic scattering.
  • Employing computer calculations to process diffraction data and construct detailed atomic structure models comprising 5000 atoms.
  • Performing Voronoi polyhedral analyses on the generated structure models to characterize local atomic arrangements.

Main Results:

  • The local atomic structures in both Fe(84)Nb(7)B(9) and Fe(70)Nb(10)B(20) amorphous alloys were successfully modeled and analyzed.
  • A strong correlation was observed between the local atomic structures of the amorphous alloys and the crystalline phases that emerge after annealing.
  • Structural differences were identified that help explain the observed variations in stability between the two amorphous Fe-Nb-B phases.

Conclusions:

  • The atomic-level structural configurations in Fe-Nb-B amorphous alloys are intimately linked to their potential crystalline counterparts.
  • The detailed structural models provide a basis for understanding the thermodynamic stability differences between amorphous Fe-Nb-B alloys.
  • This research contributes to the fundamental understanding of amorphous alloy structures and their phase transformations.