mtm10 - Engineering 45 The Structure and Properties of...

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Page 1 Engineering 45 The Structure and Properties of Materials Midterm Exam March 17, 2010 Problem 1: (25 points) (a) Describe how the Cu 3 Au, NaCl and ß-ZnS structures are derived from FCC. (b) Binary compounds with the Cu 3 Au structure are invariably metals, those with the ß-ZnS structure are usually semiconductors, and those with the NaCl structure are usually insulators. Why might you expect this behavior? Problem 2 (25 points): The Second Law of Thermodynamics states that the entropy of an isolated system can only increase. The change in entropy in an infinitesimal change of state is dS = 1 T dE + PdV - k µ k dN k 2.1 where T is the temperature, E is the internal energy, P is the pressure, V is the volume, µ k is the chemical potential of the k th component and N k is the mole number of the k th component. (a) Let two solids have fixed volumes and chemical contents, and let their temperatures be different. Show that if they interact only with one another energy (heat)
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This note was uploaded on 04/05/2011 for the course ENGIN 45 taught by Professor Devine during the Spring '07 term at University of California, Berkeley.

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mtm10 - Engineering 45 The Structure and Properties of...

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