Synthesis, crystal structure and magnetic properties of new indium rhenium and scandium rhenium oxides, In6ReO12 and Sc6ReO12

The new complex indium rhenium and scandium rhenium oxides, In6ReO12 and Sc6ReO12, have been synthesized as single phases in sealed silica tubes and by high-pressure high-temperature syntheses, and their crystal structures have been determined by single crystal X-ray diffraction.The compounds crystallize in a rhombohedral structure related to the distorted fluorite structure like Ln6ReO12 for some rare earth elements, S. G.: R-3, Z=3, aH= 9.248(2) Å, cH=8.720(2) Å for Sc6ReO12 and aH=9.492(1) Å, cH=8.933(1) Å for In6ReO12. A maximum in magnetization is observed for Sc6ReO12 at T(Mmax)=1.89(2) K, whereas ferromagnetic ordering is found for In6ReO12 by a pronounced increase in the temperature dependence of magnetization at TC=7.5(5) K. The magnetic moment per rhenium ion in In6ReO12 and Sc6ReO12 is 0.84(1) and 0.65(1) μB, respectively, derived from the paramagnetic regions.

Crystal structure of M6ReO12 (M=In, Sc) showing the distribution of ReO6 octahedra and M3+ cations in the unit cell.Figure optionsDownload as PowerPoint slide