lecture13 - Chem 131 Spring 2008 Ionic Solids Worksheet#1...

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1 Chem 131, Spring 2008 Ionic Solids Worksheet #1 Empirical formulas, formula units Explain the following questions: a. What is the empirical formula of the unit cell shown below? b. How many times does this formula occur within the unit cell? This is the number of formula units. c. If you had to try to name this unit cell, what would you call it?
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2 Chem 131, Spring 2008 Ionic Solids Worksheet #2 Unit cells, holes, structure types The types of holes within unit cells are defined by the number of atoms surrounding the hole. A hole surrounded by six atoms is called an octahedral (O h ) hole, and a hole surrounded by four atoms is called a tetrahedral (T d ) hole. The fcc structure type contains both O h holes and T d holes. If an ion is located in an O h hole, it is 6-coordinate (has 6 nearest neighbors); in a T d hole, it is 4-coordinate. Using (x,y,z) coordinates, starting at any corner of an fcc unit cell, O h holes are located at ( ½ , ½ , ½ ) (i.e., the center of the cell) and ( ½ ,0,0), (0, ½ ,0), (0,0, ½ )… (i.e., the middle of each edge). T d holes are located at ( ¼ , ¼ , ¼ ), starting from any corner. Explain the following questions:
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lecture13 - Chem 131 Spring 2008 Ionic Solids Worksheet#1...

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