Body-centered-cubic # and types of holes?


by sparkle123
Tags: bodycenteredcubic, holes, types
sparkle123
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#1
Dec29-10, 05:34 PM
P: 176
In the Body-centered-cubic (BCC) unit cell which types of holes (interstices) are there? (tetrahedral, octahedral, or cubic) How many of each type?

Thanks!
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berkeman
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Dec29-10, 06:16 PM
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Quote Quote by sparkle123 View Post
In the Body-centered-cubic (BCC) unit cell which types of holes (interstices) are there? (tetrahedral, octahedral, or cubic) How many of each type?

Thanks!
What do you think? What would your answers be and why?

http://www.members.tripod.com/~eppe/jpgs/bodcubic.jpg

sparkle123
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#3
Dec29-10, 06:24 PM
P: 176
They look like octahedral holes to me, but online literature says tetrahedral OR cubic OR tetrahedral and octahedral.

MEGACONFUSION

berkeman
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Dec29-10, 06:29 PM
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Body-centered-cubic # and types of holes?


Nuts, my image source went away. I got it from Google Images, so here's another:

http://www.ul.ie/~walshem/fyp/Bcc%20unit.gif



You might try browsing through some Google Images for Body Centered Cubic, to see if the images help to show the shape of the spaces better...
berkeman
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Dec29-10, 06:30 PM
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Quote Quote by sparkle123 View Post
They look like octahedral holes to me, but online literature says tetrahedral OR cubic OR tetrahedral and octahedral.

MEGACONFUSION
Can you post the links to the conflicting online sources? Thanks.
berkeman
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#6
Dec29-10, 06:43 PM
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BTW, this website looks promising, but I'm not able to run the animations here at work (the Active-X control is not being allowed past our firewall). See if it helps you?

http://www.chm.davidson.edu/vce/crystals/index.html

.


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