Fe3O4/Co3O4 core-shell nanocomposites modified structure and properties of heavy metal oxide diamagnetic glasses

摘要

Transition metal oxides nanomaterials are attractive for electrical, optical and magnetic applications due to their small polaron hopping, narrow band gap and strong spin-orbit interaction. Herein, 80 nm Fe3O4/Co3O4 core shell nanocomposites were synthesized and doped to heavy metal oxides glasses to evaluate the influence to glass structure, spectra and properties using varies characterization techniques. SEM, BET and XRD analysis confirm the successful synthesis of core-shell nanocomposites, and XPS, FT-IR and Raman spectra reveal the modification of CoO6 and CoO4 groups on glass frame BiO3, BiO6, PbO4 and BO3 units. UV-VIS spectra show a red-shift on cutoff wavelength with two absorption bands at 550 nm and 750 nm due to T-4(1g)(F) -> T-2(1g) (H) octahedral transition of Co2+ and T-5(2g) -> E-5(g) octahedral transition of Co3+ ions, respecitvely, which in turn contributed to electric conductivity. The evolution of Co2+ and Co3+ and their modification on glass induced changes on thermal, mechanical, magnetic and magneto optical properties.