Abstract
A new phase in the system Sc–Re–O, ScRe 2 O 6 , was synthesized for the first time in sealed silica tubes and its crystal structure was solved by single crystal X-ray diffraction. ScRe 2 O 6 (space group P 2 1 / a , a =5.6176(9) Å, b =4.7970(9) Å, c =7.5143(16) Å, β =97.49(2)°, Z =2) crystallizes in a new rutile-type structure, derived from three formula units by splitting the cation site in ratio 1:2. Re 2 O 10 clusters can be considered as structural units, in which the rhenium ions form pairs by metallic bonds with a Re–Re distance of 2.523(3) Å. No phase transition was observed in the temperature range of 295–930 K. The compound has a metallic character of conductivity in the temperature range of at least 4–950 K and displays a ferromagnetic ordering above room temperature (“unconventional Re-magnetism”). Crystal structure of ScRe 2 O 6 in the ac-plane showing the [Re 2 O 6 ] n layers separated by Sc-layers
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