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← ScienceWhich consequence results when electrons encounter a nanocrystalline grain boundary?
A)Increased electrical resistivity occurs✓
B)Enhanced thermal conductivity results
C)Grain size reduction accelerates
D)Dislocation density decreases sharply
💡 Explanation
Increased resistivity occurs because electron scattering from disorder increases via the mechanism of Bragg diffraction; because grain boundaries disrupt the lattice periodicity, electrons diffract leading to energy loss, therefore resistivity increases rather than conductivity improvements.
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