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  • 1990-1994
  • 1980-1984
  • 1975-1979  (3)
  • 1978  (3)
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  • 1990-1994
  • 1980-1984
  • 1975-1979  (3)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 439 (1978), S. 250-254 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the System Ba2Gd2/3□1/3U1-xWxO6 and Hexagonal Perovskites of an 18-Layer TypeIn the system Ba2Gd2/3□1/3U1-xWxO6 the formation of a continuous solid solution series is observed. With x ≤ 0.9 the mixed crystals have a cubic 1:1 ordered perovskite structure. With x ≥ 0.95 the compounds are polymorphic: besides an cubic 1:1 ordered perovskite type for x = 0.95; 0.99 and 1.00 one hexagonal layer structure exists. This lattice is in all cases rhombohedral (space group R3m) and represents an 18 L-type. Likewise the compounds Ba2B2/3III□1/3WVIO6 with BIII = Tb-Lu and Y belong to the 18 L-type.
    Notes: Im System Ba2Gd2/3□1/3U1-xWxO6 wird lückenlose Mischbarkeit beobachtet. Für x ≤ 0,9 kristallisieren die Mischkristalle in einem kubischen 1:1 geordneten Perowskitgitter. Für x ≥ 0,95 tritt Polymorphie auf: neben den kubischen 1:1 geordneten Perowskittyp wird mit x = 0,95; 0,99 und 1,00 eine hexagonale Stapelvariante beobachtet. Dieses Gitter ist jeweils rhomboedrisch (Raumgruppe R3m) und stellt eine 18-Schichtenstruktur dar. Die Verbindungen Ba2B2/3III□1/3WVIO6 mit BIII = Tb-Lu und Y besitzen ebenfalls eine 18-Schichtenstruktur.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Vibrational Investigations on Ordered Perovskites A2IIBMO6. I. MO6 Octahedra: Symmetry, Force Constants, and DistancesAccording to their vibrational spectra the ordered perovskites A2IIBMO6 can be divided in three groups: compound with 1. MO6 octahedra of symmetry Oh, 2. MO6 octahedra of lowered point symmetry, 3. different kinds of MO6 octahedra. The force constants, M—O distance and bond order are calculated.
    Notes: Die geordneten Perowskite A2IIBMO6 Können auf Grund ihrer Schwingungs-spektren in 3 Gruppen eingeteilt werden: Verbindungen mit 1. MO6-Oktaedern der Symmetrie Oh, 2. MO6-Oktaeder mit erniedrigter Punktsymmetrie, 3. mit verschiedenen Sorten an MO6-Oktaedern. Die Kraftkonstanten, M—O-Abstände und Bindungsgrade werden berechnet.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 445 (1978), S. 152-156 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Compounds of the Type Ba3RE2TeO9In the BaO—RE2O3—TeO3 system homogeneous perovskite compounds of formula Ba3RE2TeO9 with RE = Nd, Sm-Gd, Dy-Lu, and Y are formed under special preparation conditions. With RE = ND and Sm A monoclinic lattice is observed whereas for the other RE a primitive cubic (a = 4.303 Å (Eu) to a = 4.214 Å (Lu)) lattice is found.
    Notes: Im System BaO—SE2O3—TeO3 sind einheitliche Perowskite der Zusammensetzung Ba3SE2TeO9 für SE = Nd, Sm-Gd, Dy-Lu und Y unter speziellen Darstellungsbedingungen erhältlich. Sie Kristallisieren mit SE = Nd und Sm monoklin, mit übrigen SE ist das Gitter Kubisch Primitiv (a = 4,303Å (Eu) bis a = 4, 214 Å (Lu)).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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