Abstract
The formation and growth mechanisms of germanium oxide ultrafine particles in a flame were experimentally investigated by means of TEM observation. GeO particles were initially formed at the lower part of the hydrogenoxygen diffusion flame and then evaporated as the temperature increased in the flame. In case of low concentration of raw materials, GeO particles was entirely evaporated and then appeared again as GeO2 particles through homogeneous nucleation. On the otherhand, in case of high concentration of raw materials, developed aggregates of GeO particles were oxidized from the peripheral portion accompanied by shrinkage due to the evaporation of the GeO.The formation and growth mechanisms of ultrafine particles in a flame were discussed by comparing germanium oxide particles with the silica particles reportted in the literature.
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