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Old Jan 14th 2011, 07:14 AM   #1
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Join Date: Apr 2010
Posts: 3
unit translation vectors, bcc structure

1. The problem statement, all variables and given/known data
Can someone please try to help me with this. I have a bcc structure and the question is ''Clearly indicate the unit translation vectors and state their value in .
I have attached the sketch :
http://img440.imageshack.us/img440/4879/picture3lh.jpg
are those t1,t2,t3 translation vectors?
I know the cell parameters are:$\displaystyle a=b=c=31652\AA$
Are these correct values of t1,t2,t3 then?
$\displaystyle t_{1}=(-\frac{a}{2},\frac{a}{2},\frac{a}{2})=(-15826,15826,15826)\AA ?$
and similarly the rest?
And one question more. We need to calculate the volume of the conventional unit cell and volume of the primitive unit cell, is this correct?
$\displaystyle V_{conv}=a^{3}=3171\AA^{3}$
$\displaystyle V_{primitive}=\frac{V_{conv}}{2}}=1585.5\AA^{3}$
Is the plane which has the highest degree of compaction (101)??
and the deree of compaction$\displaystyle \frac{\sqrt{2}}{a^2}}$???

Does latex work on this forum at all?
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bcc, structure, translation, unit, vectors



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