title: Single-crystal X-ray diffraction and electron-microscopy study of multiple-twinned Sr(3)(Ru0.336,Pt0.664)CuO(6).
abstract: Sr(3)(Ru(0.336),Pt(0.664))CuO(6) crystallizes as a monoclinic structure [space group R12/c; lattice parameters a = 9.595 (15), b = 9.595 (15), c = 11.193 (2) A and gamma = 120 degrees ]. The crystal structure is pseudotrigonal and the crystal investigated here by single-crystal X-ray diffraction was a multiple twin composed of six individuals. The twin laws are a combination of rhombohedral obverse/reverse twinning plus the threefold axis from the trigonal system. The crystal structure is related to the hexagonal perovskites. Each Pt/Ru atom is coordinated pseudo-octahedrally by O atoms, while the overall coordination polyhedra for Cu atoms can be regarded as a strongly distorted trigonal prism, where the Cu atom is clearly shifted from the center. Each [(Ru(0.336),Pt(0.664))O(6)] octahedron is connected to two Cu-O polyhedra via a common edge, and thus chains are formed parallel to the crystallographic c axis. Sr(2+) ions are incorporated between the chains and are coordinated by eight O atoms. All bond distances and angles are in good agreement with literature values. Electron-microscopy studies confirm the results from X-ray diffraction and all observed domain structures can be interpreted exactly with the established twin model. No indication of Pt/Ru ordering was found in either the X-ray or the electron-microscopy investigation.
authors.affiliation: Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany. k.friese@fkf.mpg.de
authors.forename: Karen
authors.initials: K
authors.lastname: Friese
authors.forename: Lorenz
authors.initials: L
authors.lastname: Kienle
authors.forename: Viola
authors.initials: V
authors.lastname: Duppel
authors.forename: Hongmei
authors.initials: H
authors.lastname: Luo
authors.forename: Chengtian
authors.initials: C
authors.lastname: Lin