SYNTHESIS AND STRUCTURE OF SbNB_3(Se_2)_6, A NEW ONE-DIMENSIONAL TERNARY NIOBIUM SELLURIDE COMPOUND

SbNb_3(Se_2)_6, Mr=1347.99, tetragonal, P4/mnc,a=b=9.466(2),c=19.075(3) ,V=1709.0(4) ~3, z=4, Dm=5.2(2)g/cm~3, Dc=5.24g/c~3,λ(Moka)=0.71069 ,μ=287.39cm~(-1), F(000)=2328,T=276(1)k,R=5.9％,Rw=6.9％, for 479 unique observed reflections (1>3σ(1)).The structure is composed of [Nb3(Se2)s]∞ chains along the c axis with Sb atoms inserted between them.