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Unformatted text preview: and a unit cell of cubic symmetry with a cell edge length of 0.43 nm. The atomic weights of the A and X elements are 86.6 and 40.3 g/mol, respectively. On the basis of this information, which of the following crystal structures is (are) possible for this material: rock salt, cesium chloride, or zinc blende? Justify your choice (s). PROBLEM 6: TiCaO 3 has the perovskite structure. On this basis calculate the size of the unit cell of TiCaO 3. PROBLEM 7: Determine whether or not a cylindrical specimen of aluminum oxide having a flexural strength of 300 MPa (43,500 psi) and a radius of 5 mm will fracture when subjected to a load of 7500 N in a threepoint bending test. Assume the support point separation to be 15 mm. PROBLEM 8: Explain why crystalline ceramics are harder, yet more brittle than metals?...
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 Spring '08
 MEYERS

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