(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A wavelength of 0.7107 Angstroms is used to analyse a polycrystalline sample with a known FCC lattice structure. The interplanar spacing of the first peak is 0.3 A. Calculate 2θ for the first 3 peaks on the XRD pattern. First 3 peaks occur at (111), (200) and (220).

2. Relevant equations

nλ = 2dsinθ.

d = a/sqrt(h^2 + k^2 + l^2)

3. The attempt at a solution

I used d = a/sqrt(h^2 + k^2 + l^2) to find the lattice parameter. You're given d for the (111) plane. I then used this value for a to find d for the remaining planes, followed by the diffraction angle for these planes. Was I correct in assuming that a is the same for each and every set of miller indices? I can't see any other way of doing this than this way.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: XRD Question.

Can you offer guidance or do you also need help?

Draft saved
Draft deleted

**Physics Forums | Science Articles, Homework Help, Discussion**