Abstract

The lattice parameters of Ti 2O 3 and (Ti 0.98V 0.02) 2O 3 have been measured as a function of temperature (24–670°C for Ti 2O 3 and 24–440°C for V-doped Ti 2O 3) from single crystal X-ray data. The high temperatures were attained by blowing hot argon directly on the crystal mounted on an automatic Philips diffractometer. This experimental set-up gives standard deviations which are at least 10 times better than those of the previous measurements and allows to keep Ti 2O 3 as such well above the transition. The variations of a, c, c a (hexagonal axes) for pure Ti 2O 3 are in agreement with the previous results. On the contrary we did not observe any transition in the unit cell volume. The V-doping seems to attenuate the transition which is visible only on the a vs T curve

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