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HW 9 WITH CORRECT SOLUTIONS...

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1. For a ceramic compound, what are the two characteristics of the component ions that determine the crystal structure?

2. Show that the minimum cation-anion radius ratio for a coordination number of 4 is 0.225.

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4. Compute the atomic packing factor for the rock salt crystal structure in which rC/rA = 0.414.

5. Calculate the density of FeO, given that it has the rock salt crystal structure.

6. Magnesium oxide has the rock salt crystal structure and a density of 3.58 g/cm3. Determine the unit cell edge length.

7. Calculate the number of Frenkel defects per cubic meter in zinc oxide at 1000°C. The energy for defect formation is 2.51 eV, while the density for ZnO is 5.55 g/cm3 at 1000°C.

8. For the ZrO2–CaO system, write all eutectic and eutectoid reactions for cooling.

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