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Related Experiment Videos

Why silicon is hard.

J J Gilman

    Science (New York, N.Y.)
    |September 10, 1993
    PubMed
    Summary
    This summary is machine-generated.

    Covalent solids like silicon are brittle due to limited dislocation movement. This brittleness is explained by an atomic process analogous to chemical substitution, revealing why these materials resist deformation.

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    Area of Science:

    • Materials Science
    • Solid-State Physics
    • Chemical Physics

    Background:

    • Covalent solids, such as silicon, exhibit hardness and brittleness, unlike metals and ionic salts.
    • Dislocation motion in covalent solids is restricted, occurring only at elevated temperatures.
    • A clear explanation for this phenomenon has been elusive, despite its significance in materials mechanics.

    Purpose of the Study:

    • To provide a satisfactory explanation for the brittleness of covalent solids.
    • To elucidate the atomic-level mechanisms governing dislocation movement in these materials.
    • To link the mechanical properties of covalent solids to their bonding characteristics.

    Main Methods:

    • Analogy between dislocation movement and chemical substitution reactions.
    • Utilizing correlation diagrams for atomic process analysis.
    • Investigating the role of atomic bonding symmetry in material deformation.

    Main Results:

    • The critical atomic process for brittleness is analogous to a chemical substitution reaction.
    • Analysis reveals a high resistive stress and high activation energy for dislocation motion.
    • Dislocation kink movement disrupts atomic bonding symmetry, a process that is energetically unfavorable.

    Conclusions:

    • The observed brittleness of covalent solids is fundamentally linked to an atomic substitution-like process.
    • High resistive stress and activation energy are direct consequences of this process.
    • The breaking of atomic bonding symmetry during dislocation motion explains the material's resistance to deformation.