Question

How to determine a particular microstrututure to be fcc or bcc?

Answer 1

Answer:

The procedure is straightforward and is something that we teach to our first year undergraduate students when we introduce them to diffraction. I'll describe the old-fashioned paper and pencil method:

First, measure the 2-theta values of the lowest angle diffraction peaks in your pattern and list them in a column. For each, calculate [sin(theta)]^2 and then compute the ratios of successive values of [sin(theta)]^2, and list these as the nearest integer. These are labelled "N" below. For a first example, suppose we have the following 2-theta values and their results: