Radius Ratio of Crystal: Interstitial vs Large Atom

AI Thread Summary
The discussion centers on the radius ratio of interstitial versus large atoms in crystals, emphasizing that the differences depend significantly on the specific crystal and the types of atoms involved. Clarification is sought regarding the textbook definitions and the need for visual aids, such as diagrams, to better understand these concepts. The conversation highlights the importance of the repeating patterns in crystals and the concept of unit cells, which can be centered on any atom. It is noted that various types of unit cells exist, some of which are retained for historical reasons. Visual representations, particularly in three dimensions, are suggested as essential for grasping structural vectors.
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in the radius ratio of a crystal, what is the difference between the radius of the interstitial atom and large atom?
 
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Don't you think that depends one heckuva lot on exactly what crystal you are talking about and what the atoms are?

Unless you are asking about the difference in meaning and I would think that would be obvious!
 
i guess so, but i saw that in a textbook about crystallography, and I'm not really clear on what's the difference... it'd be nice if that book could show those two things in a picture or diagram...
 
The bulk of a crystal is a repeating pattern,
so a "unit cell" can be centered on any atom.
There are many different types of "unit cells",
some retained for the sake of tradition.

Whenever the book describes structure vectors,
assemble a set of sticks in 3-d to show them.
Especially at first, 2-d drawings might not cut it.
 
ok, thanks!
 

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