PXRD. Diffraction patterns of each sample were obtained using a high-resolution laboratory Stoe Stadi-P powder diffractometer operating in Debye-Scherrer geometry. The diffractometer had a molybdenum X-ray source and a primary Ge (111) monochromator centered at 0.7091 Å. Two Mythen Dectris detectors collected scattered X-ray intensity. Samples for analysis were lightly ground in an agate mortar and pestle before transferring to 0.7 mm borosilicate capillaries.