Abstract
The Ni1+xTe2 phase has been investigated primarily by powder neutron diffraction. Several compositions in the range Ni1.82Te2 to NiTe2 have been studied at room temperature and all except Ni1.82Te2 showed complete occupation by nickel atoms of alternate layers normal to the c direction. No c axis long-range order could be detected in Ni1.82Te2, and in two samples of lower nickel content (Ni1.67Te2 and Ni1.54Te2) disordering occurs at high temperature. The order-disorder process transforms the CdI2 superstructure containing interstitial nickel atoms into a cation deficient NiAs structure. Critical temperatures have been determined (Tc=1080+or-20K and 750+or-50K for Ni1.54Te2 and Ni1.67Te2, respectively) and interaction energies have been estimated from the Bragg-Williams model.
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