Abstract
The compounds Ti 3Se 4− x Te x are prepared. Their structure closely depends upon thermal conditions of synthesis. Treatments at 600°C and quenching give pure monoclinic compounds isotypic with Ti 3Se 4 and Ti 3Te 4 in narrow ranges of composition ( x ⩽ 0.5 and x ⩾ 3.5). At 800°C, polycrystalline pure products are obtained with an hexagonal B8 unit cell ( a′, ∋') when x ⩾ 3. At 1000°C, for x ⩽ 3.5, almost pure compounds crystallize with that same hexagonal unit cell; an orthorhombic lattice is observed for x = 4. Moreover, twinning is observed on single crystals obtained after quenching from 800 or 1000°C, with x = 1, 2, 3 and 4. These crystals seem to exhibit an hexagonal unit cell (2 a′, 2∋'), but in fact their lattice is orthorhombic or monoclinic with a real I unit cell: a ≈ a′√3, b ≈ a′, c ≈ 2 c′. The explanation of the phenomenon allows us to correct some misinterpretations found in the literature on “TiTe” single crystals.
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