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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 509 (1984), S. 145-152 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Oxidation Products of Intermetallic Compounds. III. Low Temperature Forms of K2Sn2O3 and Rb2Sn2O3 and a Notice about K2Ge2O3By controlled oxidation of KSn (at 320°C) and RbSn (at 410°C) with O2 the hitherto unknown low temperature forms of K2Sn2O3 (a = 8.4100(8) Å) and Rb2Sn2O3 (a = 8.6368(8) Å) are obtained, which are isotopic with cubic K2Pb2O3. Oxidation at higher temperatures (at 510-5207°C) leads to the well-known HT-forms. The Madelung Part of Lattic Energie, MAPLE, is calculated for both compounds.K2Pb2O3, Rb2Pb2O3, Cs2Pb2O3, and Cs2Sn2O3 have been prepared too by oxidation of KPb, RbPb, CsPb, and CsSn.Oxidation of KGe (at 400°C) leads to the first oxogermanate(II), K2Ge2O3 (cubic a = 8.339(1) Å, isotypic with K2Pb2O3) together with K6Ge2O7.
    Notes: Aus KSn bzw. RbSn entstehen durch direkte Oxydation K2Sn2O3 bzw. Rb2Sn2O3 bei 320°C bzw. 410°C die bislang unbekannten „Tieftemperaturformen“ (a = 8,4100(8)Å bzw. a = 8,6368(8)Å), isotyp mit kubischem K2Pb2O3. Bei höherer Temperatur (510 bzw. 520°C) entstehen die bekannten Hochtemperaturformen.Der Madelunganteil der Gitterenergie, MAPLE, wird berechnet und diskutiert.Ebenso erhält man durch direkte Oxydation von KPb, RbPb, CsPb und CsSn die Oxide K2Pb2O3, Rb2Pb2O3, Cs2Pb2O3 und Cs2Sn2O3. Durch Oxydation von KGe wurde bei 400°C erstmals K2Ge2O3 (kubisch a = 8,339(1) Å; isotyp mit K2Pb2O3) neben K6Ge2O7 erhalten.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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