e87 mtm - Engineering 45 The Structure and Properties of...

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Engineering 45 The Structure and Properties of Materials Midterm Examination October 26, 1987 Problem 1: (a) The compound CsCl is an ordered arrangement of Cs and Cl over the sites of a BCC lattice. Draw the unit cell. (b) Show that each atom in the CsCl structure has eight nearest neighbors. (c) Most materials that have the CsCl structure are metals or insulators. Why would you expect this? Problem 2: (a) Define and distinguish between a glass and a crystal. (b) SiO 2 can be made into a glass by rapid cooling. However, almost all com- mercial glasses have ionic impurities added to the SiO 2 base material, in part to make the glass easier to process. Why? Problem 3: (a) A binary system of atoms of types A and B has a simple eutectic phase diagram. The A-rich solid solution ( α ) has a maximum solubility of 8 atom percent B at the eutectic temperature (500 K), but dissolves much less than 1 atom percent B at room temperature (273 K). The B-rich solid solution (ß) has a maximum solubility of 5 atom
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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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e87 mtm - Engineering 45 The Structure and Properties of...

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