Lec-40-Chap-11-2 - Talc Diamond CHE 131 Lecture 27...

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CHE 131 Lecture 27 – Crystalline Solids Chapter 11: pp. 508-519. Fig. 11-18, p.509 Talc Diamond Table 11-5a, p.508 Table 11-5b, p.509
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Solids crystalline solids • solids with long-range ordering • homogenous solid formed by a repeating, three-dimensional pattern, having fixed distances between constituent parts amorphous solids • lacking definite form • solids with no long-range ordering Unit Cell • repeating pattern of atoms, molecules, and ions that can be repeated by shifting an edge dimension along its axes. Three Different Cubic Unit Cells Body Center Cubic
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Center Atom plus 1/8 of Each Corner Atom Na Cl: Na + and Cl - ions are both octahedrally coordinated. Face-Centered Cubic Structure Cl - Na + Fig. 11-24, p.517 Unit Cells of Metals cubic: a = b = c α = β = γ = 90° simple cubic (primitive cubic) atoms only at corners of cube body centered cubic (BCC) atoms at the corners and at the center of the body. face-centered cubic (FCC) atoms at the
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Lec-40-Chap-11-2 - Talc Diamond CHE 131 Lecture 27...

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