Bonus Quiz 1 - How many atoms As atoms per unit cell...

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Review Assessment: Bonus Quiz 1 https://oak.vanderbilt.edu/webapps/assessment/review/review.jsp?attemp... 1 of 1 2/11/2007 5:56 PM 2006.01.SPR.ENG.MSE.150.02 MATERIALS SCIENCE I > TOOLS > MY GRADES > VIEW ATTEMPTS > REVIEW ASSESSMENT: BONUS QUIZ 1 Review Assessment: Bonus Quiz 1 Name Bonus Quiz 1 Status Completed Score 20 out of 20 points Time Elapsed 0 hours, 1 minutes, and 13 seconds out of 0 hours and 15 minutes allowed. Instructions Question 1 2 of 2 points The III-V compound semiconductor, GaAs, has the crystal structure of a-ZnS (S atoms in a FCC arrangement and Zn atoms in 4 of the 8 tetrahedral interstitial sites) What is the coordination number (i.e., number of nearest neighbor atoms) in this structure? Selected Answer: 4 Correct Answer: 4 Question 2 2 of 2 points How many atoms Ga atoms per unit cell? Selected Answer: 4 Correct Answer: 4 Question 3 2 of 2 points
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Unformatted text preview: How many atoms As atoms per unit cell? Selected Answer: 4 Correct Answer: 4 Question 4 2 of 2 points Describe the chemical bonding in GaAs Selected Answer: covalent/ionic Correct Answer: covalent/ionic Question 5 4 of 4 points If the electronegativity of Ga is X Ga = 1.8 and As is X As = 2.2, calculate the percentage of ionic character of the chemical bond in GaAs. % ionic = (1 e 1/4(Xga Xas)^2 ) x 100 Selected Answer: 4% Correct Answer: 4% Question 6 4 of 4 points Calculate the lattice constant (a) for GaAs in nm (r Ga = 0.126 nm and r As = 0.120 nm). Selected Answer: 0.5681 nm Correct Answer: 0.5681 nm Question 7 4 of 4 points Calculate the density of GaAs (g/cm 3 ) (AW Ga = 69.72 g/mole, AW As = 74.96 g/mole, 6.023 x 10 23 atoms/mole) Selected Answer: 5.241 g/cc Correct Answer: 5.241 g/cc...
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