Morphology of Iron-Oxide Nanoparticle-Dispersed Glass Composites

概要

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We obtained dispersed-nanocrystal/glass composites by impregnating amorphous yttrium iron garnet (YIG) nanoparticles (produced by an alkoxide method) into the 49 nm diameter pores in the spongelike structure of porous silica glass (controlled pore glass or CPG) followed by heat treatment at 1000°C for 0.1 h. We observed the surface and cross section of the sample by field emission scanning electron microscopy (FE-SEM). The backscattered electron image (BSEI) of the sample surface clearly showed the nanoparticles while the secondary electron image (SEI) showed them obscurely. A similar observation of the sample cross section revealed that the CPG fused together ${\sim}2$ μm in depth from the surface while its inner core preserved the spongelike network structure. The particles were independently dispersed with sizes ranging from 20 nm to 40 nm in this fused shell with an average particle density of approximately 100 μm-2. No particles were found in the inner core. Even in the fused shell, no particles were found in those areas in which the spongelike structure was preserved. It is concluded that the particles act as seeds for triggering the fusion of the spongelike glass.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2004-10-15