Abstract
Successful preparation of glassy and polycrystalline hollow microspheres 5–35μm in diameter with the composition identical to yttrium-aluminum-garnet (YAG, Y3Al5O12) is reported. Hollow glass microspheres (HGMs) were prepared by flame spheroidization process from powder precursor. Controlled crystallization of the product resulted in preparation of hollow polycrystalline microspheres (HPMs) with the average size of the YAG grains 540±40nm by controlled heating at 1200°C. The amorphous structures and crystallization behaviors of YAG HGMs were investigated by X-ray diffraction (XRD). Morphology and microstructure of the hollow glass and polycrystalline microspheres were observed by scanning electron microscope (SEM). Hollow YAG glassy and polycrystalline microspheres are candidates as thermal insulation materials, hydrogen and nitrogen storage, or agents for cancer treatment.
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