Building 6H-SiC, does this look right?

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SUMMARY

The discussion focuses on the assembly of the 6H-SiC polytype, specifically the construction of its unit cell starting from a hexagonal unit cell of SiC (Moissanite). The user has created a 5X5X1 extended structure to conduct tests on the (0001) and (000-1) surfaces. Clarifications were sought regarding the nature of 6H-SiC and its classification as hexagonal closed packed. The user expressed challenges in understanding solid state terminology related to crystals and lattices.

PREREQUISITES
  • Understanding of solid state physics concepts
  • Familiarity with crystal structures and polytypes
  • Knowledge of SiC (Silicon Carbide) properties
  • Experience with unit cell construction and visualization
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  • Research the properties and applications of 6H-SiC in semiconductor technology
  • Learn about the differences between hexagonal and cubic SiC polytypes
  • Explore solid state physics resources focusing on crystal lattices
  • Investigate computational tools for modeling crystal structures
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Materials scientists, solid state physicists, and engineers involved in semiconductor research and development, particularly those working with Silicon Carbide materials.

Richie9384
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I'm having some difficulty understanding how to assemble a particular polytype of SiC and I think I may have made a mistake...my solid state knowledge is limited.

Basically I start with a hexagonal unit cell for SiC (Moisssanite; four atoms), I attached an image of this unit...I then extended it to build what I think is the unit cell of 6H-SiC (12 atoms)...then I extended the unit cell 5X5X1 (ABC) 6H-SiC so I can run tests on the (0001) and (000-1) surfaces.

Moissanite.png

Moissanite Hexagonal SiC

6H-SiC_Hexagonal.png

6H-SiC Unit Cell

Rotated_View_6H_SiC.png

Rotated View of the 5X5X1 Structure

yz.png

Another view in the yz-plane
 
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isn't 6H-SiC just hexagonal closed packed? It has been a long time since I looked at the polytypes of SiC
 
Dr Transport said:
isn't 6H-SiC just hexagonal closed packed? It has been a long time since I looked at the polytypes of SiC

Yes, I'm just trying to verify if I'm assembling this correctly. I'm having a hard time understanding some of the solid state jargon and concepts about crystals and lattices.

zig-ziag chain structure hexagonal SiC.gif

The 6H-SiC unit cell is shown in this diagram.
 

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