Lab1 Procedure

Lab1 Procedure - This ABA arrangement represents the...

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Lab1 Procedure Part 1: Begin by connecting four Styrofoam balls with toothpicks to form a line. This will be the base of a ten-ball triangular structure. Repeat this process to make a line of three Styrofoam balls. Attach this next layer to the base using toothpicks. Continue the process until a triangle is formed. Repeat the entire process to make another identical triangle. These triangles will make up the first and third layers of the packing model. To construct the second layer, repeat the steps above, but this time, make a triangle structure with a three-ball base. Lay the first layer of balls down on the table. Place the second layer on top of the first layer, such that the second layer’s peaks fit within the first layer’s valleys. Place the third layer on top of the second layer, directly above the first layer.
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Unformatted text preview: This ABA arrangement represents the hexagonal close packed structure. Now place layer threes peaks within layer twos valleys, such that layer three is not directly above layer one. This ABC arrangement represents the face-centered cubic structure. Part 2: Place the Petri dish full of Bbs, which represent atoms, on the table. Shake the Bbs around to simulate the heating of atoms in a metallic substance. Gradually slow the movement of the Bbs to simulate crystal formation. Notice the arrangement of the Bbs and the inconsistencies in their formation. These inconsistencies in the crystalline formation lines are called dislocations, and they cause free spaces called vacancies in the atomic structure....
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This note was uploaded on 09/29/2008 for the course ENGR 30014 taught by Professor Kolesar during the Spring '08 term at TCU.

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