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  • 1
    Electronic Resource
    Electronic Resource
    Ein neues Metagermanat: RbK[GeO3]-oligomere (Rb2GeO3) oder polymere (K2GeO3) Anionen [1]? (1993)
    Springer
    Monatshefte für Chemie 124 (1993), S. 529-537 
    Details
    ISSN: 1434-4475
    Keywords: Alkali metal metagermanate ; Crystal structure ; MAPLE calculations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary By heating a well ground mixture of the binary oxides RbO0.59, KO0.55 and GeO2[Rb:K:Ge=3.1:2.8:2; Ni-tube; 550 °C (27d) and 450 °C (22d)] colourless single crystals of Rb2K2[(GeO3)2] were obtained for the first time: space group Pnma witha=1322.51(14) pm,b=557.25(5) pm,c=1155.09(5) pm. The structure was determined by four-circle diffractometer data [Mo- $$K_{\bar \alpha }$$ , 1311 from 1362I 0(hkl),R=4.0%,R w =2.6%]. The Madelung Part of Lattice Energy, MAPLE, and the Effective Coordination Numbers, ECoN, the latter via Mean Fictive Ionic Radii, MEFIR, have been calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00819521
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  • 2
    Electronic Resource
    Electronic Resource
    Madelung ConstantsDedicated to Prof. Wilhelm Klemm on the occasion of his 70th birthday (1966)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 5 (1966), S. 95-106 
    Details
    ISSN: 0570-0833
    Keywords: Madelung constants ; Crystal structure ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Madelung constants are simple numbers which depend on the type of structure investigated. They are needed for the calculation (using the Born-Haber cycle) of lattice energies and enthalpies of formation of ionic compounds. Each Madelung constant is the sum of partial Madelung constants which represent the contributions of the individual ions to the total lattice energy. The partial Madelung constants depend on the ionic charge and, clearly though not stringently, on the coordination number. On the other hand, each Madelung constant can be represented by a sum of Madelung constants for related simple primitive AB structures. Surprisingly, these Madelung constants are numerically interrelated in a simple manner, and are related to the partial Madelung constants of interstitial sites. - Madelung constants of parameter-dependent structures (e.g. of the rutile or anatase type) and their variations with the structure-determining quantities are of particular interest. Madelung constants also yield information in the case of complex compounds and - surprisingly - of non-metal compounds (e.g. XeF2, XeF4, XeF2·XeF4).
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.196600951
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