Surface Effects Under Visible Irradiation and Heat Treatment on the Phase Stability of γ-Fe2O3 Nanoparticles and γ-Fe2O3 −SiO2 Core–Shell Nanostructures

Surface Effects Under Visible Irradiation and Heat Treatment on the Phase Stability of γ-Fe2O3 Nanoparticles and γ-Fe2O3 −SiO2 Core–Shell Nanostructures