Concepts

Crystal structures

Overview

This is a set of lattice models belonging to the cubic crystal family.

Details

Equipment

• [1] Potassium model
• [1] Copper model
• [1] Germanium model
• [1] Carbon dioxide model
• [1] Sodium chloride model
• [1] Cesium chloride model
  
• [1] Cadmium sulphide (zincblende) model
  

Script

This is a show-and-tell demo. You choose which models you want to highlight. Details of the models follow.

• Potassium
  BCC lattice, 9 atoms
  Scale 2.5 cm = 1 Å
  Space group 229
  
• Copper
  FCC lattice, 18 atoms, showing conventional cell and coordination
  Scale 2.5 cm = 1 Å for the CSL model
  Space group 225
  
• Germanium
  Diamond cubic lattice, like FCC with half of tetrahedral holes filled
  Scale 2.5 cm = 1 Å
  Space group 227
  
• Carbon dioxide (phase CO₂-I)
  FCC lattice of CO₂ molecules
  Space group 205
  
• Sodium chloride
  Two-basis FCC offset by (1/2, 0, 0) of a FCC cell
  Space group 225
  
• Cesium chloride
  Two-basis FCC offset by (1/2, 1/2, 1/2) of a FCC cell
  Space group 221
  
• Cadmium sulphide (zincblende form)
  Two-basis FCC offset by (1/4, 1/4, 1/4) of a FCC cell, or FCC of one ion with other one filling half the tetrahedral holes
  Scale 2.5 cm = 1 Å
  Space group 216
  

Additional Resources