A scanning electron microscope (Leo 1530 Gemini,Zeiss) coupled with an Energy Dispersive X-ray Analyser(SEM/EDXA) (Vantage by Thermo Electron Corporation) wasused to image and analyze the composition of the samples. Theaccuracy of the elemental analysis was ±1.5 mol%. The sampleswere also studied using an X-ray diffraction analyzer (PhilipsX’pert) with Cu K radiation (λ = 1.5418°A) to analyze the crys-talline phases present. The scans were performed from 2θ = 0 to60◦with a step size of 0.02◦.