Which mechanical consequence results when vacancy defects aggregate in a crystal lattice?

💡 Explanation

Accumulation of vacancies weakens the lattice, initializing easy dislocation glide, otherwise known as the Hall-Petch Effect, therefore yielding earlier occurs, rather than strengthening the crystal; because the vacancy defect mechanism introduces lattice distortions.

• Which mechanism causes increased light transmission at specific wavelengths through photonic crystal structures?
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