Ch_11-2_Crystalline_solids1 (1)

Ch_11-2_Crystalline_solids1 (1) - Types of Solids...

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Types of Solids Crystalline—ordered, repeat pattern, unit cell Polycrystalline—built-up of many small crystals called grains Amorphous—random, no repeat pattern, no unit cell
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X-ray Diffraction Pattern (Interference phenomenon)
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Top Layer econd Layer Second Layer ( 29 sin d θ
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TEST-LIKE QUESTIONS FOR FINAL 11.73 Which of the following materials should produce well-defined x-ray diffraction patterns? (a) KBr (b) Glass (c) Water (d) Ice (e) A sugar crystal Answer: (a) (d) (e) 11.75 At what angle does first-order (n =1) diffraction from layers of atoms 293 pm apart occur, using x-rays with a wavelength of 154 pm? Answer: 15.2 º
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Unit Cells 3 Dimensional representation of unit cell. Note, angles not necessarily right angles.
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Calculating the Number of Atoms in a Unit Cell
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Atoms in unit cell 1 8 1 8 = 1 8 1 2 8 + = 1 1 8 6 4 8 2 + =
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Ionic Crystals The structure of CsCl is simple cubic. A unit cell contains 1 Cl - and 1 Cs + ion.
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Face-centered cubic. Unit cell: 4 of each ion.
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Additional Representations of NaCl
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Unit cell: 4 of each ion.
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Ch_11-2_Crystalline_solids1 (1) - Types of Solids...

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