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Use the band structure diagram for each element below to explain: a. Sodium, which has two atoms...

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Physics

Use the band structure diagram for each element below toexplain:

a. Sodium, which has two atoms in a bcc (conventional cubic)unit cell, is a metal;

b. Calcium, which has four atoms in a fcc (conventional cubic)unit cell, is a metal;

c. Diamond, which has eight atoms in a fcc (conventional cubic)unit cell with a basis, is an electrical insulator, whereas siliconand germanium, which have similar structures, are semiconductors.Why is diamond transparent?

Answer & Explanation Solved by verified expert
3.9 Ratings (661 Votes)
to distinguish between metals and non metals on the basis ofband theory we consider and energy band filled with electrons uptoa certain value It is the effective number of free electronspresent in this band that gives information about the conductivityof the elementFor a lattice of parameter L the    See Answer
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