Impact of Annealing Temperature on Lanthanum Erbium Telluride (La۰.۱Er۰.۲Te۰.۲) Nanoparticles Synthesized via Hydrothermal Approach

In this study, we synthesized La۰.۱Er۰.۲Te۰.۲ nanoparticle using ۰.۲ mol of Er(NO۳)۳·۵H۲O, ۰.۱ mol of La(NO۳)۳·۶H۲O, and ۰.۲ mol of Te(NO۳)۴ through hydrothermal and doctor blade methods. The La۰.۱Er۰.۲Te۰.۲ material reveals a hexagonal structure corresponding to a ۲theta angle of ۱۳.۲۶۳o. ۱۵.۳۷۵o. ۱۶.۹۴۳o. ۱۸.۹۲۴o. ۲۵.۷۸۸o. and ۲۷.۳۵۶o for La۰.۱Er۰.۲Te۰.۲ unannealed and ۱۳.۳۰۲o, ۱۵.۴۸۹o, ۱۶.۹۶۰o, ۱۹.۰۵۵o, ۲۵.۸۶۲o, and ۲۷.۳۷۳o for annealed samples. The XRD pattern showed that the crystallinity increased with higher annealing temperature. Unannealed La۰.۱Er۰.۲Te۰.۲ had glow-like nanoparticles. The La۰.۱Er۰.۲Te۰.۲ nanoparticles showed high absorbance in the visible area of the spectra with ۰.۶۴۸ a.u. The absorbance of the material decreased as the annealing temperature increased. The higher the annealing temperature, the lower the absorbance of the material. The unannealed nanoparticle has a bandgap energy of ۳.۵۰ eV. The annealing nanoparticles have a bandgap of ۳.۲۷ to ۲.۲۶ eV. The higher the annealing temperature, the lower the bandgap of the material

Keywords:

Rear earth element , Lanthanum , Erbium , Telluride , Nanoparticles