EMCH 371- Lecture 5

EMCH 371- Lecture 5 - Chapter 3 Crystalline Structure -...

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Chapter 3 Crystalline Structure - Continued Issues to address for this lecture Brief introduction of ceramic structure How to label points, directions and planes? Miller indices
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Ceramic Structures Chemical formula - MX Figure 3-8, Shackelford - multiple atoms/ions per lattice point
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Ceramic Structures CsCl
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Chemical formula – MX Figure 3-9, Shackelford
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NaCl
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Chemical formula – MX 2 Flourite Structure Figure 3-10, Shackelford Unoccupied volume UO 2 : reactor fuel; accommodate fission products such as helium gas
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Figure 3.11 The cristobalite (SiO 2 ) unit cell showing (a) ion positions, (b) full-size ions, and (c) the connectivity of tetrahedra. In the schematic, each tetrahedron has a Si 4+ at its center. In addition, an O 2− would be at each corner of each tetrahedron and is shared with an adjacent tetrahedron. [Part (c) courtesy of Accelrys, Inc.]
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Figure 3.12 Many crystallographic forms of SiO 2 are stable as they are heated from room temperature to melting temperature. Each form represents a different way to connect adjacent tetrahedra.
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Diamond structure The atoms are arranged on an FCC lattice with additional atoms at one- quarter of the distance along the body diagonal. 8 atoms per unit cell
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EMCH 371- Lecture 5 - Chapter 3 Crystalline Structure -...

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