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← ScienceWhich outcome occurs when gallium arsenide crystals contain arsenic vacancies?
A)Increased free electron concentration occurs✓
B)Drastically reduced thermal expansion occurs
C)Increased intrinsic mechanical hardness occurs
D)Enhanced ferromagnetic domain alignment occurs
💡 Explanation
Arsenic vacancies act as donors, because each vacancy contributes an electron to the conduction band via n-type doping. This increases free electrons; therefore, free electron concentration increases, rather than magnetic alignment or material property changes given the dopant concentration.
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