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MatSci%20201%20HW1%202008%20Solutions - MatSci 201...

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MatSci 201: Introduction to Materials Homework #1: Due Friday, September 26, 2008 by 5 PM 1. (15 points) In class on Tuesday, four examples were given to address the question, “Why Materials Science?”. Provide another example from your own discipline, describing in a few sentences (a) what the component or innovation is and (b) how materials science and engineering has contributed to its advancement. Various answers. 2. (10 points) Callister, Chapter 2, Question 2.20 2.20 Below is plotted the bonding energy versus melting temperature for these four metals. From this plot, the bonding energy for molybdenum (melting temperature of 2617°C) should be approximately 7.0 eV. The experimental value is 6.8 eV. 3. (10 points) The compound GaAs is an important semiconductor in which atoms are joined by mixed ionic-covalent bonding. What fraction of the bonding is ionic? Fraction of ionic bonding = {1 – exp[-(0.25)(X A – X B ) 2 ]} For Ga, X = 1.6 For As, X = 2.0
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Upon substitution, the fraction of ionic bonding is 0.04.
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MatSci%20201%20HW1%202008%20Solutions - MatSci 201...

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