Heterogeneous precipitation of nanocrystallites of metallic Bi and anatase was observed in CaO-Bi2O3-B2O3- Al2O3-TiO2 glass-ceramics. Addition of AlN reduced the Bi2O3 to Bi metal nanoparticles, which were uniformly dispersed in the glass. After heat-treatment of the Bi-precipitated glass around the glass transition temperature, nanocrystalline anatase precipitated out without aggregation of the Bi metal particles. It was found that the anatase nanocrystal size was affected by the distance between a nanocrystal and a precipitated Bi nanoparticle. The glass-ceramic produced is a functional material containing a random dispersion of different types of nanoparticles with different dielectric constants.
ASJC Scopus subject areas
- Physics and Astronomy(all)