The structural transformation of anatase TiO_2 by high-energy vibrational ball milling was studied in detail by different analytical methods of x-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). This structural transformation involves both phase transition and nanoparticle formation, and no amorPhization was observed. The crystallite size was found to decrease with milling time down to nanometer size ~l3 nm and approaching saturation, accompanied by phase transformation to metastable phases, i.e., TiO_2(II), which is a high-pressure phase and TiO_2(B), which was identified in ball-milled powder reported for the first time in this paper. These phases eventually started transforming to rutile by further milling.
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