Chemically ordered face-centred tetragonal Fe-Pt nanoparticles embedded SiO22 films

Abstract

Chemically ordered face-centred tetragonal (fct) Fe-Pt alloy nanoparticles (NPs) embedded SiO2 films were synthesized on glass substrate by in situ hybrid sol-gel approach followed by heating at 450-900 °C in air and reducing (10% H2-90% Ar) atmospheres. Heat treatment of Fe/Pt co-doped films in air caused generation of Pt NPs first. At this stage, Fe remained in ionic state covalently bonded with silica network. Further heat treatment at 800- 900 °C in reducing atmosphere facilitated the formation of uniformly dispersed fct Fe-Pt alloy NPs in amorphous SiO2 film matrix. The generated alloy composition was estimated by grazing incidence X-ray diffraction and TEM analysis to be Fe0.42Pt0.58 which is close to the nominal value. © Indian Academy of Sciences.