# X-ray diffraction pattern

1. Apr 28, 2009

### superwolf

I want to find which elements and planes the intensity peaks in this graph comes from. The X-rays in the diffractometer are have a wavelength of 0.709 Å. The $$2 \theta$$ values for the peaks (including double peaks) are: 11.84, 19.56, 20.04, 23.28, 33.88 and 39.16.

Nickel, iron, silicon, graphite and copper are the materials I am likely to find.

Bragg's law:

$$2dsin \theta = n \lambda$$

What should I do? Calculate d?

$$d = \frac{n \lambda}{2 sin \theta_{hkl}}$$

What is n?

Here are some data:
Nickel: http://rruff.geo.arizona.edu/AMS/xtal_data/DIFfiles/10253.txt
Graphite: http://rruff.geo.arizona.edu/AMS/xtal_data/DIFfiles/11023.txt
Silicon: http://rruff.geo.arizona.edu/AMS/xtal_data/DIFfiles/10342.txt
Copper: http://rruff.geo.arizona.edu/AMS/xtal_data/DIFfiles/13267.txt
Iron: http://rruff.geo.arizona.edu/AMS/xtal_data/DIFfiles/00669.txt