Questions About Reciprocal Lattice Edge Length

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lemonxx
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Reciprocal Lattice Edge Length
Hi. So, i am currently studying reciprocal lattices, and am not quite sure how to find the edge length of a reciprocal lattice. for example I had expected the RL of BCC, which is FCC, to have edge lengths 2pi/a but it turns out it is 4pi/a, how come?
 

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