Key to Quantum WB

Key to Quantum WB - Chem 124 Dr. Neff KEY to Solid State...

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Chem 124 Dr. Neff KEY to Solid State Chemistry Workbook You will be responsible for ALL the solid state material on Exam 3. 1. Find the repeating square unit cells in each of the following patterns.
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Chem 124 Dr. Neff 2. 2. In each of the cases shown below, draw z-diagrams for the unit cells shown and determine the net number of atoms per unit cell. a) Nickel, as well as many other metals, crystallizes in the structure shown below 4 net atoms, from 8 x 1/8 + 6 x 1/2 b) Polonium is the only element known to crystallize in the structure shown below. 1 net atoms, from 8 x 1/8 c) Iron, as well as many other metals, crystallizes in the structure shown below 2 net atoms, from 8 x 1/8 + 1 d. Shown in the figure below is the unit cell structure for one form of C, the diamond structure. Also shown is the corresponding z-diagram for this unit cell. Using this z-diagram, determine the contribution of atoms to each z-layer, and from this, determine the net number of atoms contained within one unit cell. z = 0, 1 z = 0.5
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Chem 124 Dr. Neff In z = 0,1, see a net contribution of 2 atoms In z = 0.25 there are 2 atoms completely in cell In z = 0.5, there are 4 atoms each 1/2 in the cell so 4 x 1/2 = 2 z = 0.75 is just like z = 0.25, so there are 2 atoms completely in cell There are 8 net atoms in this unit cell 3. Find the simplest formula for the following unit cell structure. Put the “elements” in the formula in alphabetical order. z=0, 1 z= 0.25 z = 0.5 z = 0.75 KEY: A 2 atoms in body of unit cell B 4 x 1/8 + 6 x ¼ = 2 C 2 x ½ + 1 = 2 A 2 B 2 C 2 which reduces to ABC 4. a) Draw a set of z-diagrams for a unit cell having the hypothetical formula M 2 N. Be sure that the unit cell is a cubic variant and has a regular structure. Remember that the bottom (z = 0) and top (z = 1) layers must be the same. Note that there is probably more than one way to draw z-diagrams to
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This note was uploaded on 02/10/2009 for the course CHEM 124 taught by Professor Hascall during the Spring '08 term at Cal Poly.

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Key to Quantum WB - Chem 124 Dr. Neff KEY to Solid State...

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