Routine X-ray powder diffraction (XRD) experiments were carried
out on a Rigaku D/max-cb X-ray diffractometer with monochromatic
detector. Copper Ka radiation was used, with a power
setting of 40 kV and 100 mA, and a scan rate of 5 min1 (40 kV,
30 mA, and a scan rate of 2 min1 for small-angle X-ray scanning)