Determine the number of formula units in the unit cells below. Show specifically how many different atoms...
Determine the number of formula units in the unit cells below. Show specifically how many different atoms contribute and whether they contribute from a corner, face, or edge, or they are entirely contained within the unit cell.
a) CaF2 in a unit cell of fluorite
b) TiO2 in a unit cell of rutile
Homework Answers
Corner shared contribute 1/8 th.
Face share contributes 1/2 th
Edge shared contributes 1/4 th
Inside point contributes 1 .
| Name | No. of corner shared atom | No of face shared atom | no of edge shared atom | no of entire containing atom | Formula units per unit cell |
| CaF2 | Ca=8,F=0 | Ca=6,F=0 | 0,0 | Ca=0,F=8 | 4 |
| TiO2 | Ti=8,O=0 | Ti=0,O=4 | 0,0 | Ti=1,O=2 | 2 |
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