The effectiveness of titanium ions toward crystal structure, microstructure and optical properties of La_0.5Sr_0.5Mn_1-xTi_xO₃ nanopowders

Abstract

Titanium subrogated lanthanum strontium manganite LSMO (La_0.5Sr_0.5Mn_1-xTi_xO₃; Ti ratio = 0.1, 0.2, 0.3, 0.4, 0.5) nanoparticles have been prepared based on an organic acid precursor pathway using glycine-nitrate as a fuel. The effectuation of Ti⁴⁺ ion concentration on the crystallo-aspects, microstructure as well as the optical features was scrutinized. Exemplary, orthorhombic perovskite LSMTO with a space group Pbnm were manifested at low annealing temperature 800 °C for period 2h. Further, insertion of Ti⁴⁺ ion instead of Mn⁴⁺ ion in LSMO commenced to increment the crystallite size from 14 to 24 nm. The FT-IR spectrum demonstrated that band around 600 cm⁻¹ linked to Mn-O become broad imputed to Ti-O stretching modes. The morphology of all samples presented the spherical clusters with enhancing the grain size by incorporation of Ti⁴⁺ ion into the LSMO crystal. Band gap energy with boost of Ti⁴⁺ ion weight ratio was found to augment from 1.83 to 2.1 eV. Meanwhile, the refractive index was found to slightly minify from 2.78 to 2.66.

Keywords:

• Lanthanum strontium manganite
• LSMO
• nanoparticles
• fabrication
• characterization
• optical properties