Powder X-ray Diffraction (PXRD)
Powder diffractograms were recorded on a Bruker D8
Advance (Bruker AXS GmbH, Karlsruhe, Germany) in
Bragg–Brentano geometry equipped with a Cu–Ka source
(k = 1.54056 A˚ ), 2.5 primary and secondary soller slits,
0.3 divergence slit, an 0.3 antiscatter slit and a position
sensitive microgap detector, Vantec-1, (Bruker AXS
GmbH, Karlsruhe, Germany). The voltage and current
applied were 35 kV and 40 mA, respectively. Samples
were placed on a sample holder which has 1 mm thickness
a