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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 121 (1990), S. 505-509 
    ISSN: 1434-4475
    Keywords: Chevrel phases ; Crystal structure ; Phase transition ; X-ray analysis ; Rietveld refinement ; Powder diffraction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Temperaturabhängigkeit der Gitterparameter und die Atomlagen der Tieftemperaturphase von SrMo6S8 wurden mittels Röntgenpulverdiffraktometrie bestimmt. Die rhomboedrische Hochtemperaturmodifikation (R $$\bar 3$$ ,a rh=6.5630(3)Å, αrh=88.9982(2)°,V rh=282.55(5)Å3,T=298 K) wandelt beiT 1=135(3) K in die trikline Tieftemperaturmodifikation (P $$\bar 1$$ ,a tr=6.481(1)Å,b tr=6.572(1)Å,c tr=6.611(1)Å, αtr=89.246(4)°, βtr=89.304(4)°, γtr=88.169(4)°,V tr=281.4(2)Å3,T=20 K) um. Die trikline Deformation ist stärker ausgeprägt als in der Ca-Verbindung und ähnlich jener der Ba- and Eu-Verbindung.
    Notes: Abstract Lattice parameters as a function of temperature for, and atomic coordinates of the low-temperature phase of, SrMo6S8 are reported from X-ray powder diffraction. The structure transforms atT 1=135(3) K from the rhombohedral high-temperature modification (R $$\bar 3$$ ,a rh=6.5630 (3) Å, αrh=88.9982(2)°,V rh=282.55(5)Å3 at 298 K) into the triclinic low-temperature modification (P $$\bar 1$$ ,a tr=6.481(1)Å,b tr=6.572(1)Å,c tr=6.611(1)Å, αtr=89.246(4)°, βtr=89.304(4)°, γtr=88.169(4)°,V tr=281.4(2)Å3 at 20K). The triclinic distortion is larger than in the Ca analogue, and similar to the Ba and Eu analogues.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 76 (1989), S. 413-444 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A comprehensive review of structure work on high-T c oxides as reported during the years 1987 and 1988 is given. Thirteen structures are refined from X-ray single-crystal and/or neutron powder diffraction data:I. (Ba1−x ,K x )BiO3 (T c =30 K),II. (La2−x , Sr x )CuO4 (T c =40 K),III. (Nd, Ce, Sr)2CuO4 (T c =28 K),IV. (Nd2−x , Ce x )CuO4 (T c =24 K),V. YBa2Cu3O7 (T c =90 K),VI. YBa2Cu4O8 (T c =80 K),VII. Y2Ba4Cu7O14 (T c =40 K),VIII. Pb2Sr2NdCu3O8 (T c =70 K),IX. TlBa2CaCu2O7 (T c =103 K),X. TlBa2Ca2Cu3O9 (T c =120 K),XI. Tl2Ba2CuO6 (T c =90 K),XII. Tl2Ba2CaCu2O8 (T c =112 K),XIII. Tl2Ba2Ca2Cu3O10 (T c =125 K). Except forI (perovskite type),II (K2NiF4 type) andIV (Nd2CuO4 type) they represent new structure types. Structure data, bond distances, structure drawings and calculated X-ray powder diffraction patterns are given for each compound. Structural features and correlations with superconductivity are discussed. The review contains 301 citations.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of low temperature physics 37 (1979), S. 231-237 
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: An x-ray powder diffraction analysis at 5 K shows that the structure of Cu1.8Mo6S8 in the superconducting state is a triclinic distorted version of the rhombohedral room temperature structure. The distortion is due to a clustering of the Cu atoms into pairs [d(Cu-Cu) = 2.58 å] as the compound transforms at 270 K from the disordered high-temperature into the ordered low-temperature modification.
    Type of Medium: Electronic Resource
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