E 45 - Spring 2005 - Morris - Midterm 1

E 45 - Spring 2005 - Morris - Midterm 1 - Engineering 45...

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Engineering 45: Mid-term Exams 1987-2005 Page 34 Engineering 45 The Structure and Properties of Materials Midterm Exam March 16, 2005 Problem 1: (35 points) (a) Describe how the Cu 3 Au, NaCl and ß-ZnS structures are derived from FCC. (b) Only one of these structures is commonly found in compound semiconductors. Which? Why? (c) One of these structures commonly transforms into a disordered solid solution at higher T. Which? Justify your choice. (d) Two of these structures are common in ionic compounds. Which? Justify your choice. (e) Suppose you are given a binary ionic compound, AB, and asked to predict its structure without recourse to any complex calculation. What information would you ask for, and how would you use it to make the prediction? Problem 2: (30 points) Suppose you are asked to predict the structure of the metallic element, A. (a) Your friend, the physicist, tells you that he can calculate the cohesive energy of A in any possible crystal structure. Given his results for all common structures. how
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This note was uploaded on 01/27/2011 for the course BIOE 104 taught by Professor Various during the Spring '10 term at Berkeley.

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E 45 - Spring 2005 - Morris - Midterm 1 - Engineering 45...

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