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azam
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Join Date: Jan 2011
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BCC and FCC Structure

02/14/2011 11:49 AM

Is it true that BCC structure has low interstitial spaces than FCC... if yes then how? Because the atomic packing factor of FCC is higher than BCC... therefore interstitial spaces in FCC should be low comparatively...
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Tornado
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#1

Re: BCC and FCC structure

02/14/2011 11:59 AM

Bad acronym alert.

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Doorman
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#2

Re: BCC and FCC Structure

02/14/2011 1:31 PM

The FCC (Face Centered Cubic) crystal structure has a packing efficiency of 0.74, or 74% This in contrast to BCC (Body Centered Cubic) which is 0.68. More efficient packing = less interstitial space.

For more information see the section of this Wiki article titled 'Close Packing', or this article regarding close packing of spheres.

And as mentioned, it is a good idea to define your acronyms.

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Anonymous Poster
#4
In reply to #2

Re: BCC and FCC Structure

02/15/2011 9:18 AM

it means that FCC(face centered cubic) has low interstitial space than BCC(body centered cubic)
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Tornado
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#3

Re: BCC and FCC Structure

02/14/2011 7:37 PM

Here is some further information: http://mathworld.wolfram.com/SpherePacking.html

(I think some of these lattices are what I've also seen described as cuboctahedral and rhombic-dodecahedral. Even those two may be the same thing.)

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