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Title: Crystal structure of Yb2CuGe6 and Yb3Cu4Ge4 and the valency of ytterbium
Authors: Peter, Sebastian C.
Subbarao, Udumula
Sarkar, Sumanta
Vaitheeswaran, G.
Svane, Axel
Kanatzidis, Mercouri G.
Keywords: Physical Chemistry
Materials Science
Metallurgy & Metallurgical Engineering
Metal Flux Technique
Crystal Growth
X-Ray Diffraction
Crystal Structure
Valence Electronic Structure
X-Ray Absorption
Ordered Superstructure
Molten Gallium
Liquid Gallium
Metal Flux
Issue Date: 2014
Publisher: Elsevier Science Sa
Citation: Peter, SC; Subbarao, U; Sarkar, S; Vaitheeswaran, G; Svane, A; Kanatzidis, MG, Crystal structure of Yb2CuGe6 and Yb3Cu4Ge4 and the valency of ytterbium. Journal of Alloys And Compounds 2014, 589, 405-411,
Journal of Alloys And Compounds
Abstract: The Yb2CuGe6 and Yb3Cu4Ge4 compounds were synthesized from reaction mixtures using indium as flux. Both powder and single crystal X-ray diffraction data were used to refine the crystal structures. Yb2CuGe6 crystallizes in the monoclinic space group C2/m in the La2AlGe6 type structure. The lattice parameters are a = 8.0011(16) angstrom, b = 8.1962(16) angstrom, c = 10.682(2) angstrom and beta = 100.63(3). The crystal structure of Yb2CuGe6 can be described as the intergrowth of fragments Ge dimmers and zig-zag Ge chains. Yb3Cu4Ge4 crystallizes in the orthorhombic space group Immm in the Gd3Cu4Ge4 type structure. The lattice parameters are a = 4.1302(8) angstrom, b = 6.5985(13) angstrom and c = 13.691(3) angstrom. X-ray absorption near edge spectroscopy (XANES) measurements indicate that Yb in Yb2CuGe6 and Yb3Cu4Ge4 exists as intermediate and trivalent states, respectively. The structural refinement of Yb2CuGe6 is corroborated by total energy calculations within the local density approximation. (C) 2013 Elsevier B.V. All rights reserved.
Description: Restricted Access
ISSN: 0925-8388
Appears in Collections:Research Papers (Sebastian C. Peter)

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