Interstitial Order-Disorder Transformation in the Ti-O Solid Solution : I. Ordered Arrangement of Oxygen
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The crystal structure of the interstitial solid solution of alpha titanium-oxygen system has been investigated by a combined method of electron, neutron and X-ray diffraction as functions of composition and annealing temperature. The existence of two-types of interstitial superstructure has been established over nearly the whole composition range below the critical temperature. One of them designated as a' has a layer-ordered structure of the anti-Cd(OH)_2 type (space group P3ml) involving out-of-steps with regard to oxygen distribution. The other is a low-temperature form a'' which has a trigonal symmetry (space group P31c) with the cell dimension of a=√<3>a_0 and c=2c_0 (a_0 and c_0 are the lattice constants of the original h.c.p. cell). The oxygen distribution in this phase is generally specified in terms of composition dependent parameters of occupation probabilities for the three octahedral interstitial sites 2(a), 2(c) and 2(d). The structure of a'' at a special composition of TiO_<0.33> coincides with the model proposed by Holmberg.
- 東北大学の論文
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