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Unformatted text preview: Show that Pauling’s first and second rules apply to the compound CsCl. r Cs+ = 1.67 Å , r Cl-= 1.81 Å . r/R = 1. 67 Å /1.81 Å =0.92. CN=8 is expected since the ratio is between 0.73—1.0. Strength of Cs +-Cl- bond = 1/8. Valence of anion, Cl, is one 1 = (CN around Cl) x (1/8). CN around Cl is 8. These are consistent with CsCl structure. 4. What is piezoelectricity? Applied electric field results in setting up an electric charge on the surface of a material. Conversely when an electric field is applied to the material, the material expands in one direction and contract in another direction. 5. What is the glass transition temperature? Temperature separating the super-cooled liquid state from glassy state. 6. What is a polymorphic transformation? Transformation between different crystal structures with the same chemical composition....
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- Spring '08
- Glass, Glass transition, CsCl structure, small crystal effect, shortest wavelengh radiation, x-ray diffraction laboratories