Synthesis, Structure, and Physical Properties of a Novel Quaternary Niobium Telluride, Nb2FeCu0.35Te4.

Nb 2 FeCu 0.35 Te 4 , the first solid-state quaternary niobium telluride, was prepared via chemical vapor transport reactions. The structure of this compound was determined by single-crystal X-ray diffraction methods. It crystallizes in the orthorhombic system, space group Pmmn (No. 59). The unit cell dimensions are a=12.576(1) A, b=3.8395(6) A, c=7.3012(9) A, Z=2, and V=352.54(8) A 3 . Structural refinement with 433 observed reflections (I>3σ(I)) and 40 variable parameters results in R=4.0% and R w =4.8%. Nb 2 FeCu 0.35 Te 4 represents a novel three-dimensional structure type with interesting structural features and one-dimensional extended metal-metal bonds