Wigner–Seitz cell of diamond

In summary, the conversation discusses the struggle with visualizing the Wigner-Seitz cell of the Carbon diamond crystal structure, which is made of 2 FCC compenetrated. The individual is looking for help in understanding the conventional cell and the number of atoms per lattice point in the diamond structure. They also mention that the unit cell of diamond is not completely accurate as it is usually referred to as the 2 FCC compenetrated structure.
  • #1
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Hi everybody,
I'm struggling with some solid state physics topics. I am dealing with the Carbon diamond crystal structure, which is basically made of 2 FCC compenetrated. I really cannot visualize the WignerSeitz cell of this structure, is it possible to do it? I was thinking about visualizing the diamond conventional cell as an FCC where each basis is made of two C atoms, but I don't know if it's correct.
Is there someone who could help me to visualize it?
 
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  • #4
TeethWhitener said:
https://en.m.wikipedia.org/wiki/Triakis_truncated_tetrahedral_honeycomb
The Wigner Seitz cell for diamond isn’t trivial.
This is the geometry of the weigner seitz cell for crystal, but how can I visualize it inside of the conventional diamond cell? I can't see how is it shaped inside the conventional cell in order to obtain a cell that contain only one lattice point. And further more, when we consider the lattice point of a diamond like cell, are we considering a lattice point made of 1 or 2 atoms?
 
  • #5
Baluncore said:
Okay but Wikipedia says that the tetrahedral cell is the unit cell of diamond, but it's not completely accurate. The unit cell one usually refers to is the 2 FCC compenetrated structure. What I'm trying to understand is the drawing of the primitive cell inside of a diamond crystal, how many atoms are we considering per lattice point and how can it contain only one lattice point in a so complex structure.
 

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