Abstract
Single crystals of a new niobium oxide, Cs 3Fe 0.44Nb 5.56O 16 were prepared at 1200°C under an Ar atmosphere. This compound has the orthorhombic space group Pbcm and Z=4. The lattice parameters were a=10.470(3), b=7.514(4) and c=21.312(3) Å, and the final R-factors were R=0.027 and R w=0.033 for 1085 unique reflections. The crystal structure is a three-dimensional tunnel structure built up by edge- and corner-sharing NbO 6 octahedra and (Fe,Nb)O 4 tetrahedra and cesium atoms are located in two types of tunnels. The Cs + ion in the tunnels was ion-exchanged partially with Rb + ion.
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