Illinois MATSE 280 Introduction to Engineering Materials, Lecture 3 Part 2: Structure of Ceramics
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Abstract
Structure of Ceramics
Issues to Address...
Structures of ceramic materials:
How do they differ from that of metals?
- Define basic terms and give examples of each:
- Lattice
- Basis Atoms (Decorations or Motifs)
- Crystal Structure
- Unit Cell
- Coordination Numbers
- Describe hard-sphere packing and identify cell symmetry
Content
- Bonding in Ceramics
- Locating OCTAHEDRAL Interstitial Holes
- Ionic Crystals
- Tetrahedral and Octahedral Holes in Close-Packed Crystals
- Interstitials Sites in FCC
- Ionic Structures: Filling in the “holes” between Anions
- Coordination Number and Ionic Radii
- 3D Geometry: Limiting Cation/Anion Ration
- Example - Predicting AX structures
- Example EXAM QUESTIONS
- Example of AX structures: Sodium Chloride
- Sodium Chloride Structures Observed as Cubes
- Example of AX structures: Cesium Chloride
- Example of AX2: Structure of Calcium Fluoride
- Note same structures can appear differently
CaF2 with ratio of 1:2 for charge neutrality - Synopsis of Structures Found Filling Holes
- IONIC BONDS?
- C60 molecules arrange in a FCC arrangement
- Example of AmBnXp Structures
- Calculating DENSITY
- Example of Silicate Ceramics
- Crystalline Silica
- Building Blocks of Silica
- Sheets of Silica
- Kaolinite Clay
- Formation of Common Glasses
- Silicate Glasses
- Crystalline and Non-Crystalline Silica
- Carbon Based
- Diamond
- RECALL: hybrid orbitals are responsible
- Carbon Nanotubes (Multiwall, Metallic)
- SUMMARY --- Ionic crystals
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