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 A_mB_nX_p 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

Researchers should cite this work as follows:

• Duane Douglas Johnson; Omar N Sobh (2008), "Illinois MATSE 280 Introduction to Engineering Materials, Lecture 3 Part 2: Structure of Ceramics," http://nanohub.org/resources/5467.

  BibTex | EndNote

1. course lecture
2. Illinois
3. material properties
4. materials
5. material science
6. nanobio applications