Diffraction of electrons in the CubicTi5O5 superstructure of titanium monoxide |
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Authors: | A I Gusev A A Valeeva |
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Institution: | 1. Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990, Russia 2. Ural Federal University, Yekaterinburg, 620002, Russia
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Abstract: | Annealed titanium monoxide TiO1.087 has been studied by the electron diffraction method. A cubic model of the Ti5O5 superstructure (Ti5O5 (Ti90?18O90??18)) of nonstoichiometric titanium monoxide Ti x O z has been proposed on the basis of experimental data and representations about the disorder-order transition channel. It has been shown that reflections observed on the electron diffraction pattern are identified in the space group $Pm\bar 3m$ . The period of the unit cell of the cubic Ti5O5 superstructure is larger than that for the B1 basic disordered structure of Ti x O z monoxide by a factor of 3. The disorder-order transition channel Ti x O z (space group $Fm\bar 3m$ )-Ti5O5 (space group $Pm\bar 3m$ ) includes 75 superstructure vectors of seven stars {k 10}, {k 7}, {k 6(1)}, {k 6(2)}, {k 4(1)}, {k 4(2)}, and {k 1}. The distribution functions of Ti and O atoms over the sites of the cubic Ti5O5 (space group $Pm\bar 3m$ ) superstructure have been calculated. |
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