The X-ray diffraction (XRD) experiments were performed on a X’Pert Pro diffractometer operating with Cu Kα radiation (λ = 1.5406 A°). The current was adjusted to 30 mA. The voltage was increased to 40 kV. The reflection angle 2θ is in a range between 10° and 70°, it changes of 0.016° with a step of 40 s.