The X-ray diffractionwas conducted on Philips X'Pert diffractometer using CuKα radiation at a speed of 0.02°/s. The X'Pert HighScore (PW3209) program was used to analyze XRD peaks.
The chemical composition (major elements) of materials was analysed using PANalytical Axios X-ray fluorescence spectrometer.Loss on ignition was determined by heating the samples in an electrical furnace at 1000 °C during 3 h.The microstructural characterization was carried out by scanning electron microscopy (SEM – Hitachi, SU 70) and energy dispersive Xray spectrometry (EDS – EDAX with detector Bruker AXS, software:Quantax) operated at 3–30 kV