Abstract
The mechanical amorphization process of Nb2O5 was studied. After vibro-milling well crystalized Nb2O5 in the H -phase for 6 h with an amplitude 20 mm, its X-ray diffraction pattern turned into a halo pattern. On prolonged grinding, however, X-ray diffraction peaks reappeared. They belonged to a new phase (TT-phase), formed as a consequence of structural restabilization. By grinding with an amplitude 50 mm, however, no halo pattern was found on the X-ray diffractogram. Instead, apparently direct phase transformation from H-phase into TT-phase was observed even after grinding for only 5 min. The effect of amplitude on the mechanochemical structural changes is discussed in relation to the crystal lographicaI structure of Nb2O5. The disorderly states of mechanically amorphized and hydrolysed materials were very alike, judging from the radial distribution function. It is therefore concluded, that a non crystalline material very similar to a synthesized one could be obtained through a mechanical route by choosing an appropriate condition of stressing.
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Ikeya, T., Senna, M. Amorphization and phase transformation of niobium pentoxide by fine grinding. J Mater Sci 22, 2497–2502 (1987). https://doi.org/10.1007/BF01082136
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DOI: https://doi.org/10.1007/BF01082136