Investigation on versatile behaviour of Cd doped SrTiO3 perovskite structured compounds

Ferromagnetism induced by Cd ions in SrTiO3 with various x-values (x = 0, 0.01, 0.03, 0.05 wt%) was synthesized by solid state reaction. Powder XRD reveals the formation of cubic perovskite structure with space group pm3m of all the prepared compounds. FTIR confirms the metal oxide chemical bonding present in the samples. Raman spectra justify the formation of cubic perovskite structure and the presence of local disorder in the ceramics. Polydispersed behaviors of all the samples were observed through scanning electron microscope. The elemental composition of Sr, Ti, O and Cd were analysed through EDAX spectra. Visible range optical absorption was observed for the samples by UV-Visible studies then the optical bandgap values were estimated. Presence of multicolor such as violet, green and blue emission at an excitation of 330 nm in the PL spectra confirms the existence vacancies in the prepared samples. At room temperature, strontium titanate is diamagnetic, on addition of Cd in SrTiO3 lattice induces ferromagnetic signature. Hence, the induced ferromagnetic behavior of the doped samples may be understood in terms carrier mediated ferromagnetism.