CH101-Assignment 13

CH101-Assignment 13 - CsH BaS b CsCl and AgZn crystallize in the same unit cell type For CsCl a = 4.20 A for AgZn a = 3.16 A AgZn CsCl c Sr

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1. Answer the following regarding the three cubic unit cells. a) In comparing cells with the same sized atoms, which of the unit cells will have the largest value of a? (Hint: you may wish to consult Figure 8.3 and Figure 8.4 in the textbook.) body centered cubic simple cubic face centered cubic b) Which of the unit cells has the greatest coordination number? face centered cubic body centered cubic simple cubic c) Which of the unit cells has the greatest packing efficiency? simple cubic body centered cubic face centered cubic d) Which of the unit cells has the greatest amount of void space? simple cubic face centered cubic body centered cubic 2. For each pair described below, select the one with the greater density. a) BaS and CsH crystalllize in the same unit cell type. The two unit cells have the same value of a.
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Unformatted text preview: CsH BaS b) CsCl and AgZn crystallize in the same unit cell type. For CsCl, a = 4.20 A; for AgZn, a = 3.16 A. AgZn CsCl c) Sr crystallizes in the FCC arrangement, while Rb crystallizes in the BCC arrangement. They have about the same value of a. Sr Rb 3. Identify the four labeled positions in the following diagram: (Hint: you may wish to read Section 8.6 in the textbook to help you answer this question and the next question.) 1 is the conduction band 2 is the band gap 3 is the fermi level 4 is the valence band Section 8.6 4. Materials A, B, and C have the following band structures. One is a conductor, on a semiconductor, and an insulator. Identify each. A: insulator B: conductor C: semiconductor...
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This note was uploaded on 04/19/2011 for the course CH 101 taught by Professor Bigham during the Spring '08 term at N.C. State.

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CH101-Assignment 13 - CsH BaS b CsCl and AgZn crystallize in the same unit cell type For CsCl a = 4.20 A for AgZn a = 3.16 A AgZn CsCl c Sr

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