Hi If a sample of powder crystal (say Nickel) is shot with monochromatic x-rays, one will observe reflections from planes that satisfy Bragg's Law. For Ni the first four planes are (111, 200, 202, 311) with 2theta (44, 52, 76, 93 degrees) respectively.
Why doesn't one observe a reflection at, say, 45 degrees? There will be a grain oriented in the powder such that x-rays reflect at 45 degrees and so forth. I would expect a continuum of reflections... thanks for the insight. Kianoush
