Assume that x-ray diffraction patterns were recorded from an MgO specimen containing crystallites with a diameter of 100, 80, 60, or 40 nm. Calculate the width B (in degrees 2Θ) due to the small crystal size alone, assuming that Θ = 40° and λ = 0.154 nm. For 60-nm-diameter particles, calculate B for Θ = 20, 40, and 60°.
