FT-Raman and FT-IR vibrational spectroscopic studies of nanocrystalline Ba2RESbO6 (RE = Sm, Gd, Dy and Y) perovskites

The nanoparticles of Ba2RESbO6 (RE = Sm, Gd, Dy and Y) were synthesized using auto ignition combustion process. The structure and phase purity of the as-prepared nanopowders were examined by X-ray diffraction pattern. A systematic analysis of the structure of the four compounds was carried out for the first time by recording Raman and IR spectra. The four Raman active modes A1g, Eg and 2F2g were observed as strong or medium intense bands in the Raman spectra and the IR active F1u(1) mode is obtained as a strong absorption band around 630 cm−1 in all the four compounds. Hence it is confirmed that the above compounds were crystallized in the cubic symmetry with Fm3¯m space group.