Formation of Nanostructures of the Core-Shell Type upon Diffusion Phase Decomposition of Fluorophosphate Glasses

摘要

The diffusion phase decomposition of fluorophosphate glasses doped with cadmium and manganese sulfides, as well as with cadmium sulfide and erbium oxide, is investigated using optical spectroscopy. It is revealed that a two-phase structure of the core-shell type, which consists of cadmium particles with a shell composed supposedly of cadmium sulfide, can be formed in the glass matrix. The formation of the metallic phase of cadmium nanoparticles (hereafter, metallic particles) is identified from the appearance of the surface plasmon line in the range of 3 eV in the absorption spectrum of the synthesized glasses. The cadmium sulfide semiconductor phase is identified from the Raman spectra. The experimentally observed considerable broaden-ing of the surface plasmon absorption line with an increase in the time of heat treatment of the synthesized glasses is interpreted in terms of the chemical mechanism of damping.