masc lab 4 write up

masc lab 4 write up - Geoff Martindale Tuesday 1:00 Lab...

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Geoff Martindale Tuesday 1:00 Lab MASC 110L Lab #4 Objective: The objective of this lab is to understand the crystal structures of metals, and to understand the hexagonal closest packed structure and the cubic closest packed structure using plastic foam balls and toothpicks. Also to find the symmetry of the two structures. Theory: This experiment includes some basic concepts of crystal structure. The meanings of crystal, lattice, unit cell, closest packing, hexagonal closest packed (hcp) structure (abab arrangement) and cubic closest packed (ccp) structure (abcabc arrangement or face-centered cubic (fcc) unit cell). Many metals crystallize in these structures. Also, the coordination number was determined by finding the total number of atoms any single atom would have in contact with those surrounding it. Axis of symmetry were also determined and the number of n-degrees a unit cell has. Results: This is the HCP arrangement.
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This is the CCP arrangement. Discussion:
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This note was uploaded on 03/27/2008 for the course MASC 110L taught by Professor Goo during the Fall '07 term at USC.

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masc lab 4 write up - Geoff Martindale Tuesday 1:00 Lab...

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