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The compound Ni2Ta2Te4 is obtained by heating the elements at 1000℃ in evacuated silica tube. Mr=989.70, orthorhombic system,space group Pma2,a = 7.914(1),b= 6.2372(5),c=7.2362(6)A,V = 357.2(1)A3, Z = 2, DC = 9.201 g/ca3,λ(MoKα)=0.7093A,μ= 537.90Cm-1.F(000)=820. Final R=0.083 and Rw=0.103 for 889 reflections.This compound is iso-structural to Ni2Nb2Te4,with two-dimensional(2D) network structure. In each cluster unit,two Ni and two Ta atons form a rhombic plane with four Ni-Ta bonds (average 2.655 A) and one Ni-Ni bond (2.512 A) without Ta-Ta interac-action. The distorted tetrahedral coordination of each metal atons is completed by four Te atoms.The average distances are 2.792A for bonds Ta-Te and 2.556 A for bonds Ni-Te.
Mr = 989.70, orthorhombic system, space group Pma2, a = 7.914 (1), b = 6.2372 (5), c = 7.2362 (6) A, V = 357.2 (1) A3, Z = 2, DC = 9.201 g / ca3, λ (MoKα) = 0.7093A, μ = 537.90Cm-1.F (000) = 820. Final R = 0.083 and Rw = 0.103 for 889 reflections.This compound is iso-structural to Ni2Nb2Te4 with two-dimensional (2D) network structure. In each cluster unit, two Ni and two Ta atons form a rhombic plane with four Ni-Ta bonds (average 2.655 A) and one The distorted tetrahedral coordination of each metal atons is completed by four Teatoms. The average distances are 2.792A for bonds Ta-Te and 2.556 A for bonds Ni-Te .