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← ScienceWhich outcome occurs when rapidly cooling polycrystalline silicon during ingot casting?
A)Increased crystalline defect concentration occurs✓
B)Grain size becomes uniformly maximized
C)Dendritic growth velocity is strongly reduced
D)Equilibrium vacancies become thermodynamically favored
💡 Explanation
More crystalline defects result because rapid cooling prevents atoms from reaching the lowest energy configuration. The increased cooling rate doesn't provide time for annealing via diffusion, therefore defect concentration increases rather than grain size uniformity in equilibrium conditions.
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