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  • Articles: DFG German National Licenses  (3)
  • 1995-1999  (1)
  • 1980-1984  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Structure of the potassium tantalum fluoride oxide K3Ta4F7O8 (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 237-240 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740880003019
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    New considerations on the role of covalency in ferroelectric niobates and tantalates (1998)
    Springer
    The European physical journal 6 (1998), S. 307-312 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 71.20.-b Electron density of states and band structure of crystalline solids - 77.80.-e Ferroelectricity and antiferroelectricity - 77.84.Dy Niobates, titanates, tantalates, PZT ceramics, etc.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Values of Curie temperature, TC, and microwave relaxation frequency, fr, of ferroelectric niobates and tantalates are found to be closely related to the metal-oxygen network covalency. Correlations previously evidenced in perovskite-type relaxors (PSN, PST) are confirmed here for K(Ta1-xNbx)O3 (KTN) compositions. The investigated physical characteristics, TC and fr, are determined via dielectric measurements performed in a wide frequency range (102-109 Hz) and as a function of temperature (250-800 K). On a theoretical point of view, bond covalencies are evaluated through tight-binding band structure calculations. The complex role of covalency on the metal potential is precised. Two antagonist effects acting on both the short-range interatomic repulsions and the rigidity and stability of the oxygen-metal network are discussed. The validity of this approach is comforted through the example of the oxyfluoride K3Li1.5Ta5O14.5F0.5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050553
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Recent developments in the field of high oxidation states of transition elements in oxides stabilization of Six-coordinated Iron(V)Dedicated to Professor Rudolf Hoppe on his 60th birthday (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 491 (1982), S. 60-66 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Neue Entwicklungen auf dem Gebiet der hohen Oxydationsstufen der Übergangsmetalle in Oxiden. Stabilisierung des sechsfach-koordinierten Eisen(V)Eine Bestimmung der physikalischen Eigenschaften von Eisen, Cobalt, Nickel und Kupfer hoher Oxydationsstufen in Oxiden zeigt den Einfluß der chemischen Bindung und struktureller Faktoren auf die elektronische Konfiguration. Diese Zusammenhänge werden gezeigt bei der Synthese des ersten sechsfach-koordinierten Eisen(V)-oxids: La2LiFeO6.
    Notes: An evaluation of the physical properties of iron, cobalt, nickel, and copper high oxidation states in oxides shows the influence of chemical bonding and structural factors on the electronic configuration. Such correlations are illustrated by the synthesis of the first six-coordinated iron(V) oxide: La2LiFeO6.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19824910109
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    Paper (German National Licenses)
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