Abstract
Abstract Vanadium ditelluride, V1.04Te2, has a Cd(OH)2-type structure with unit cell dimensions ah = 3.638 A and ch = 6.582 A above the transition temperature Tt of 482 K. Below Tt the structure is monoclinic, space group C2 m , with cell dimensions am = 18.984 A(≈3ah√3), bm = 3.5947 A (≈ah), cm = 9.069 A (≈√(3a2h + c2h)), β = 134.62°. This low-temperature form is isostructural with NbTe2 and TaTe2 (which do not show a phase transition); the vanadium atoms form double zigzag chains with VV distances of 3.316 A, which distort the Te lattice. Complex diffraction patterns were observed due to the simultaneous occurrence of the distortion of the Cd(OH)2-type structure of vanadium ditelluride in three equivalent directions. Similar patterns were found for the Nb and Ta ditellurides.
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