Ch13_Solids - Ch 13. Structures, Properties, and...

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1 Ch 13. Structures, Properties, and Applications of Solids th Ed.
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2 Types of Solids Crystalline Solids Solids with highly regular arrangements of components Amorphous Solids Solids with considerable disorder in their structures
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3 Crystalline Solids Unit Cell Smallest segment that repeats regluarly Smallest repeating unit of lattice 2-Dimensional Unit Cells
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4 Crystal Structures Have Regular Patterns Lattice Many repeats of unit cell Regular, highly symmetrcial system Three (3) dimensional system of points designating positions of components Atoms Ions Molecules
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5 Three Types Of 3-Dim Unit Cells Simple cubic Has one host atom at each corner Edge length a = 2r where r is radius of atom or ion. Body-centered cubic (BCC) Has one atom at each corner & one in center Edge length Face-centered cubic (FCC) Has one atom centered in each face, & one at each corner Edge length r 2 2 a = 3 r 4 a =
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6 Close Packing in 2 Dimensions Most efficient arrangement of spheres in 2-D Each sphere has 6 nearest neighbors
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7 Close Packing of Spheres 1 st layer 2 nd layer Square lattice: 2-dimensional arrays
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8 Two Ways to Put on 3 rd Layer 1. Directly above spheres in 1 st layer 2. Above holes in 1 st layer remaining holes not covered by 2 nd Cubic lattice: 3-dimensional arrays
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9 ABA Above Atoms ABC Above Holes Two Ways to Put on 3 rd Layer
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10 3-Cubic Lattices Unit Cells Simple Cubic Body- Centered Cubic Face- Centered Cubic
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11 3-Dim Simple Cubic Lattice A) Unit Cell B) Portion of lattice—open view C) Space filling model
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12 Ionic Solids Lattices of Alternating charges Want cations next to anions Maximizes electrostatic attactive forces
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Ch13_Solids - Ch 13. Structures, Properties, and...

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