FCC Reciprocal to BCC: Proving Equation

In summary, the conversation is about finding the value of a dot product in a proof involving reciprocal lattice vectors. One person is struggling to understand how the value is obtained while the other offers a solution and points out a mistake. The final equation is simplified to y.y + z.z = 2.
  • #1
Piano man
75
0

Homework Statement



The proof seems fairly straight forward, but after plugging in the primitive vectors to the equations for the reciprocal lattice vectors, I'm getting
[tex]2\pi\frac{\frac{a^2}{4}(x+y-z)}{\frac{a}{2}(y+z)\cdot(\frac{a^2}{4}(-x+y+z))}[/tex]

One proof I checked said that the bottom line's
[tex](y+z)\cdot(-x+y+z)=2[/tex]

I don't see how. Any ideas?
 
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  • #2
Hi Piano man! :smile:

If this is a dot product then x.y = y.z = z.x = 0. :wink:
 
  • #3
:blushing: :facepalm:

thanks I completely forgot that.
So it would reduce to y.y + z.z = 2

A tad embarrassing not to spot that :D
 

1. What is the FCC reciprocal to BCC equation?

The FCC reciprocal to BCC equation is a mathematical relationship between the face-centered cubic (FCC) crystal structure and the body-centered cubic (BCC) crystal structure. It states that the reciprocal lattice vectors of an FCC lattice are equivalent to the reciprocal lattice vectors of a BCC lattice multiplied by a factor of √2.

2. How is the FCC reciprocal to BCC equation derived?

The FCC reciprocal to BCC equation is derived using the Bravais lattice concept and the reciprocal lattice vector calculations for FCC and BCC structures. It involves finding the inverse of the lattice vector in the FCC structure and multiplying it by the lattice vector in the BCC structure.

3. What is the significance of the FCC reciprocal to BCC equation?

The FCC reciprocal to BCC equation is significant in understanding the relationship between different crystal structures and their reciprocal lattices. It also helps in predicting the diffraction patterns of materials with either FCC or BCC structures.

4. Can the FCC reciprocal to BCC equation be applied to other crystal structures?

No, the FCC reciprocal to BCC equation is specific to the FCC and BCC crystal structures only. Other crystal structures have their own unique reciprocal lattice vectors and cannot be derived using this equation.

5. How is the FCC reciprocal to BCC equation used in scientific research?

The FCC reciprocal to BCC equation is used in materials science and crystallography research to analyze and understand the crystal structures of various materials. It is also used in X-ray and neutron diffraction experiments to determine the crystal structures of unknown materials.

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