1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: What is the atomic spacing D of this crystal?

  1. Nov 29, 2008 #1
    1. The problem statement, all variables and given/known data
    X rays with wavelength 0.10 nm are incident on a crystal with a hexagonal crystal structure. The x-ray diffraction spectrum is shown in the figure.

    Figure: knight_Figure_24_40.jpg

    What is the atomic spacing D of this crystal? (in nanometers)

    2. Relevant equations

    The Bragg condition:
    2*D*cos(theta)=m*lamda where, m=1,2,3...

    3. The attempt at a solution

    (m+1)/(m) ==> cos(50.1)/cos(71.3) = (2/1)

    (m+1)/(m)==> cos(15.8)/cos(71.3) = (3/1)

    D=(2*lamda)/(2*cos(theta_2)==> (lamda)/cos(theta_2)==> (0.10nm)/cos(50.1)=0.16nm

    I just followed a similair example in the book. Maybe I'm getting it wrong because I'm not factoring anything in about the hexagonal shape in my math? *Note: this is a challange problem.
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted