1R50.20 Crystal Models (Carbon Allotropes)
Concepts
Crystal structures, allotropes
Overview
The models demonstrate various crystal structures for carbon.
Details
Equipment
- [1] Graphite model
- [1] Diamond model
- [1] Buckminsterfullerene model
Script
This is a show-and-tell demo that allows you to compare and contrast allotropes of carbon. Here are some data:
- Graphite (alpha form)
Layer C-C distance: 1.42 Å
Scale 2.5 cm = 1 Å for CSL model - Diamond
Cubic cell shown - Buckminsterfullerene (C60)
C-C distance: average 1.44 Å
Single bonds (pentagon edges): 1.46 Å
Double bonds (hexagon edges): 1.40 A
Mean ball diameter (C atoms treated as points): 6.83 Å
Inner/outer ball diameter: 6.83 +/- 3.35 Å
FCC lattice constant: 14.17 Å
Additional Resources
References
- PIRA 1R50.20
Disclaimer
- Don't attempt this at home!
Last revised
- 2018
Technicals
- There are two graphite models, one each made by Leybold and Crystal Structures Limited. The diamond model was manufactured by Leybold. The Buckminsterfullerene model was made by Klinger.
Related demos
If you have any questions about the demos or notes you would like to add to this page, contact Ricky Chu at ricky_chu AT sfu DOT ca.