The above figure shows the effect of “ball-milling” on the X-ray diffraction pattern of a sample of silicon powder. The Miller indices of the two reflections are indicated.

(a) What is the most likely cause of the changes in the appearance of the X-ray diffraction pattern upon ball-milling?

(b) What possible conclusions can be drawn from the observation that the half widths of the (220) and (311) reflections of the sample treated for 2 hours are essentially the same?

Transcribed Image Text:

220000 200000 - (220) (113) 180000 - 2 hours 1 hour O hours 160000 - 140000 120000 - 100000 - 80000 60000- 40000 - 20000 48 50 52 54 56 58 20 (degrees) Intensity (counts) 220000 200000 - (220) (113) 180000 - 2 hours 1 hour O hours 160000 - 140000 120000 - 100000 - 80000 60000- 40000 - 20000 48 50 52 54 56 58 20 (degrees) Intensity (counts)

Answer rating: 100% (QA)

Answer a It is clear that the XRD XRay Diffraction peaks have broad... View the full answer