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← ScienceWhich consequence results when point defects cluster intensely in a crystal lattice?
A)Reduced minority carrier lifetime
B)Increased phonon mean free path
C)Enhanced ductile-brittle transition✓
D)Improved radiative recombination efficiency
💡 Explanation
Clustering point defects amplifies existing stress concentrations around dislocations, triggering crack nucleation via the Peierls-Nabarro stress mechanism because the local stress surpasses the material's fracture toughness. Therefore, the material embrittles rather than remaining ductile because plastic deformation is suppressed.
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