HW#1 ME2733

HW#1 ME2733 - 10 Louisiana State U niversity Mechanical...

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10 Louisiana State U niversity Mechanical Engineering Department ~ Professor Meletis Spring 2004 ME 2733 Materials of Engineering Homework Assignment #1 (due: in class Thursday, 02/05/04) The potential energy (V) between two adjacent ions in a solid can be represented by the expressIOn: B A v=- + a aU where a is the interatomic distance and A and B are constants. Calculate the bonding energy V o in terms of the parameters A and B using the following steps: (a) Differentiate V with respect to a, and then set the resulting expression equal to zero. Note that V versus a is minimum at V 0. (b) Solve the previous expression for a in terms of A and B. This yields ao, the equilibrium interatomic distance- ( c ) Obtain the expression for V 0 by inserting ao in the equation given above. 2 Give the electron configuration (shorthand electron notation) for the following ions Fe2+, Fe3+, Cu+, Ba2+, Br-, and S2-. [Problem 2.7 in text] - ~ 3 Sodium chloride (NaCl) exhibits predominantly ionic bonding. The Na + and CJ
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HW#1 ME2733 - 10 Louisiana State U niversity Mechanical...

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