Structural, optical, magnetic and dielectric properties of Dy-doped SrTiO3 nano ceramics

Abstract

In the present work, pure and various concentration of dysprosium (0, 1, 3, 5%) doped SrTiO3 ceramics were synthesized by solid state reaction. The structural examination based on X-ray diffraction reveal the cubic perovskite of strontium titanate ceramics. Raman spectra justifies the formation of cubic perovskite structure and the presence of local disorder in the ceramics. Irregular morphology with ploy dispersed nature of the prepared ceramics were determined by scanning electron microscopy. Optical absorption studies demonstrate the intriguing visible range absorption and multi-color emission. Further, the band gap values are deliberated using UV and PL shows violet, green and blue emission at an excitation of 330 nm. At room temperature strontium titanate is diamagnetic, on addition of Dy in SrTiO3 lattice exhibits anti-ferromagnetic signature. As the doping level increases due to Dy–Dy interaction anti-ferromagnetic signature is increased. The dielectric constant e′ value is very low, as the content of Dy increases in Sr–Ti–O lattice the constant value augmented and space charge polarization is present.