Transcription of CHAPTER 3: CRYSTAL STRUCTURES
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CHAPTER 3: CRYSTAL STRUCTURES
CRYSTAL Structure: Basic Definitions - lecture Calculation of material density self-prep. CRYSTAL Systems lecture + self-prep. Introduction to Crystallography lecture + self-prep. X-Ray Diffraction (XRD) lecture CHAPTER 3: CRYSTAL STRUCTURES atoms pack in periodic, 3D arrays typical of: Crystalline -metals -many ceramics -some polymers atoms have no periodic packing occurs for: Non-crystalline -complex STRUCTURES -rapid cooling crystalline SiO2 Non-crystalline SiO2 "Amorphous" = Non-crystalline MATERIALS AND PACKING Glass-Ceramics Quartz tubing is fabricated from beach sand The lamp applications are shown in the GE product montage Ceramics Crystals: atoms have long range periodic order Glasses (non-crystalline).
entire crystal lattice can be constructed. Lattice points Atomic hard sphere model . Crystal Systems: Possible Unit Cell Shapes • Goal is to Quantitatively Describe (a) Shape and Size of the Unit Cell (point symmetry) (b) Location of the Lattice Points (translational symmetry)
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