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The low temperature form of the phase, TiO, which is stable in the composition range TiO0.9-TiOa.1 below 990°C, has been investigated by electron microscopy/diffraction and X-ray.powder methods. The unit cell is monoclinic (space group A2/m) with a=5.855, b=9.340, c=4.142 A and y= 107°32. The structure is similar to that of NaC1, but has an ordered array of vacant lattice sites. Half of the titanium and half of the oxygen atoms are missing alternately in every third (110) plane. Microstructural features of the ordered phase are also described and the crystallography of the ordering transformation is discussed.
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Jostsons et al. (1968) studied this question.
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