Twinning and short-range order in ordered titanium monoxide |
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Authors: | A A Valeeva A I Gusev |
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Institution: | (1) Institute of Solid-State Chemistry, Ural Division, Russian Academy of Sciences, Pervomaĭskaya ul. 91, Yekaterinburg, 620219, Russia |
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Abstract: | Electron diffraction was used to study the annealed titanium monoxide TiO1.087 containing the monoclinic ordered phase Ti5O5. The diffraction pattern of titanium monoxide in the (112)* B1 plane of the reciprocal lattice of the parent B1 cubic structure contains not only structural, superstructural, and additional reflections but also a system of planar diffuse strips. It has been established that part of the additional reflections are twins of the superstructure reflections of the monoclinic ordered phase; the twinning plane is the ( $\overline 1 \overline 1 1$ ) plane of the reciprocal lattice of the parent cubic phase. The diffuse scattering contours cover finite plane areas in the reciprocal space characterized by the wave vectors K 100 ~ ± (h + 0.07)k 100, K 010 ~ ±(k + 0.07)k 010, and K 001 ~ ±(l + 0.07)k 001 in the B1 structure. The diffuse scattering is caused by short-range displacement order. Short-range substitution order and the corresponding diffuse scattering are absent. |
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