Electrical properties of Mo-doped SrTiO₃ prepared by solid state reaction method

In this work, we discuss about the preparation of pure and Mo-doped SrTiO 3 with various x- values (x = 0, 0.01, 0.03, 0.05 wt%) by solid state method. Powder XRD reveals the formation of space group pm3m (i.e.) cubic perovskite structure with all the prepared compounds. Existence of active Raman modes due to the bending and stretching vibration of Mo 6+ ions in SrTiO 3 lattice are analyzed from Raman study. Surface topology of all the samples are observed through scanning electron microscope. The elemental composition of Sr, Ti, O and Mo are examined through EDAX spectra. Optical studies reveal the visible range absorption and band gap values are deliberated using UV spectra. Dielectric constant, impedance and conductivity depend on temperature and frequency. Cole-cole plot reveals the presence of bulk resistance effect. AC conductivity determines the hopping of charge carriers between Mo 6+ and Ti 4+ ions. The correlated barrier hopping (CBH) model is identified from frequency exponent.