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MatSci%20201%20HW2%202008 - page 23 determine if there is a...

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MatSci 201: Introduction to Materials Homework #2: Due Wednesday, October 1, 2008 by 5 PM Submit in class or in the handing folder outside 3035 Cook Hall No late homework accepted. 1. (a) The packing factor for a body-centered cubic (BCC) structure is 68% when all of the atoms are of equivalent size. Later in the quarter, we will study ceramic materials where ions are of different sizes. CsCl, for example, looks body- centered cubic, except that the body center atom is different from the eight corner atoms. Based upon the table of ionic radii in your course notes (Week 1,
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Unformatted text preview: page 23), determine if there is a higher or lower packing factor in CsCl than the BCC’s 68%. Show all steps in your calculation. 2. Callister, Question 3.4 3. (a) Write the coordinates of the largest hole (we call this an interstitial) in the FCC structure (i.e. where should we put an extra atom if we were looking for the most roomy spot?). (b) How many of these sites are there per unit cell? Show this with a diagram. (c) Do the same for the BCC structure. 4. Callister, Question 3.31 5. Callister, Question 3.40 6. Callister, Question 3.66...
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