전기전자재료 과제1 솔루션

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Diamond and zinc blende Si has the diamond and GaAs has the zinc blende crystal structure. Given the lattice parameters of Si and GaAs, a = 0.543 nm and a = 0.565 nm, respectively, and the atomic masses of Si, Ga, and As as 28.08, 69.73 g/mol, and 74.92, respectively, calculate the density of Si and GaAs. What is the atomic concentration (atoms per unit volume) in each crystal?

Solution
Referring to the diamond crystal structure in Figure 1Q34-1, we can identify the following types of atoms
8 corner atoms labeled C,
6 face center atoms (labeled FC) and
4 inside atoms labeled 1,2,3,4.
The effective number of atoms within the unit cell is..

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