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← ScienceWhich mechanism causes reduced electrical conductivity in potassium iodide crystals?
A)Increased electron-hole pair recombination rate
B)Enhanced phonon scattering from vacancies
C)Decreased degree of *s/d* orbital hybridization
D)Increased concentration of *F*-centers✓
💡 Explanation
Increased presence of anionic vacancies creates *F*-centers, which trap electrons within the crystal. Because this impedes the movement of charge carriers through the lattice, leading to reduced conductivity; therefore conductivity drops, rather than enhanced transport by mobile ions or electrons in the conduction band.
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