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Which effect is diminished when grain boundary interfacial area increases?

A)Critical resolved shear stress increases
B)Band gap energy magnitudes decrease
C)Carrier mobility increases sharply then
D)Superconducting transition temperatures increase

💡 Explanation

Increased interfacial space causes electron confinement because quantum confinement increases the energy of electrons forcing discrete energy levels where the minimum energy corresponds to a rise, therefore the band gap's energy decreases rather than increasing, unlike other deformation effects.

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