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← ScienceWhich outcome occurs when dopants concentrate along grain boundaries?
A)Increased grain boundary electrical conductivity✓
B)Enhanced ferromagnetic ordering throughout solid
C)Reduced thermal expansion coefficient overall
D)Material lattice structure remains unaffected
💡 Explanation
Dopants congregating cause increased grain boundary electrical conductivity because **Segregation** of impurities creates conductive pathways along those boundaries, therefore increasing the local conductivity rather than affecting bulk properties, magnetic ordering, or thermal expansion.
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