Laboratory X-ray powder diffraction. Powder X-ray diffraction was performed with a Bruker D8 Advance powder diffractometer using Cu Kα1,2 radiation (λ = 1.54 Å) with an operating voltage of 40 kV and a current of 40 mA. X-ray diffraction powder patterns were recorded from 5-90° 2θ with a step size of 0.020° at 0.4 seconds per step.