Radius ratio

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  • #1
asdf1
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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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  • #2
HallsofIvy
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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!
 
  • #3
asdf1
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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...
 
  • #4
lightgrav
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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.
 
  • #5
asdf1
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ok, thanks!
 

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