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对于FCC晶体，要使费米球接触第一布里渊区边界，自由电子浓度是多少？（每个原子提供多少个价电子）？给出计算过程。

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对于FCC晶体，每个原子提供4个价电子。要使费米球接触第一布里渊区边界，自由电子浓度n为3.61×10^22 cm^-3......

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