Ch 1 Crystals-4

# 2 calculate the ar ratio and apf for each structure

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Unformatted text preview: ur work neatly on the back page. Label the steps and make sure your instructor can figure out your calculations. You may check your results to the values in the textbook. You will be asked to do these calculations for other structures on the tests so make sure everyone in the group understands the process to calculate them. Simple Cubic Body Centered Cubic Face Centered Cubic # of atoms per basis # of lattice points per unit cell # of atoms per unit cell Coordination Number a/r Ratio Atomic Packing Factor 3. After you calculate the APF in the table above, use the wooden models and sand to measure the APF for FCC and BCC. (Do this only if you have finished the table on Worksheet 3, and check with your instructor. When you use the sand be careful not to spill it, and be prepared to clean up afterwards.) FCC Measured values: BCC How do the calculated and measured values compare? Rev 4.1 1 - 10 Crystals 1 MatE 25 San Jose State University Lab Notes Lab Worksheet 3 Crystal Systems - Compounds 1. Build CsCl (pg. 11), NaCl (pg. 33), DC (pg. 23), and Zincblende (pg. 51) structures and fill in the table below. Once you have built each structure, study the structure and identify the lattice type. Remember there may be more than one atom per basis, so you may need to identify a group of spheres that belong to one lattice point. CsCl NaCl Diamond Cubic (Si) Zincblende (GaAs) Lattice Type # of atoms per basis # of lattice points per unit cell # of atoms per unit cell Rev 4.1 1 - 11 Crystals 1...
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## This test prep was uploaded on 02/19/2014 for the course EE 98 taught by Professor Raychen during the Spring '08 term at San Jose State University .

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