Crystal Structure: rc/ra = 1, <.23, >1

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The discussion focuses on the crystal structure based on the ratio of cation radius (rc) to anion radius (ra). When rc/ra equals 1, the structure is typically hexagonal close-packed. For rc/ra less than 0.23, the crystal structure may vary, but specific examples are not provided. If rc/ra exceeds 1, the structure can also change, indicating a different coordination environment. The conversation emphasizes the importance of understanding coordination in crystal structures beyond just the lattice type.
Ezio3.1415
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What would be the structure of the crystal if rc/ra=1? hexagonal closed packed or anything else?

What would be the structure of the crystal if rc/ra< .23 ?

What would be the structure of the crystal if rc/ra>1 ?
 
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PS: rc=radius of cation
ra=radius of anion

And I am not talking about crystal lattice... That is cubic here I think...
I am talking about co ordination of the crystal molecules,atoms,ions...
 
no one seems interested?
 

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