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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 563 (1988), S. 180-184 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zur Kristallchemie der Verbindungen des Typs MX · MgX2 · 6H2OVon den Verbindungen des Typs MX · MgX2 · 6 H2O wurden unter Variation der M+- und X--Ionen die Doppelsalzhexahydrate CsCl · MgCl2 · 6 H2O, Li(H2O)Cl · MgCl2 · 6 H2O, NH4Br · MgBr2 · 6 H2O, RbBr · MgBr2 · 6 H2O. CsBr · MgBr2 · 6 H2O, KI · MgI2 · 6 H2O, NH4I · MgI2 · 6 H2O und RbI · MgI2 · 6 H2O synthetisiert. Durch röntgenographische Untersuchungen an Pulverpräparaten wurden die Gitterparameter und die Raumgruppe bestimmt. Aus den Ergebnissen wurde die Zuordnung zu Strukturtypen vorgenommen. Danach besteht die Struktur aus einer Verknüpfung aller (M+)X6--Oktaeder untereinander über gemeinsame Ecken zu perowskitanalogen Baueinheiten, in deren Hohlräumen die Mg(H2O)62+-Oktaeder angeordnet sind. Ein “Toleranzfaktor” t von 1,045 bis 1,061, berechnet aus den Radienverhältnissen, stellt ein Charakteristikum für die obere Existenzgrenze dieser Struktur dar. Carnallit besitzt einen höheren Wert und deshalb eine andere Struktur.
    Notes: The following MX · MgX2 · 6H2O compounds (double salt hexahydrates) were synthesized by variation of the M+ and X- ions: CsCl · MgCl2 · 6 H2O, Li(H2O)Cl · MgCl2 · 6H2O, NH4Br · MgBr2 · 6 H2O, RbBr · MgBr2 · 6 H2O, CsBr. MgBr2 · 6 H2O, KI · MgI2 · 6 H2O, NH4I. Mgl2 · 6 H2O and RbI · MgI2 · 6H2O. By X-ray analysis of powder samples the lattice parameters and the space group were determined. On the basis of the results thus obtained, an identification with structural types was carried out. In accordance with the findings, the structure is made up of (M+)X6-octahedra which are linked into perovskite type units by sharing vertices. Their interstices are occupied by the Mg(H2O)62+ octahedra. A “tolerance factor” t which has been calculated on the basis of the proportion of radii and which attains values between 1.045 and 1.061 is a criterion for the upper limit of the area of existence of this structure. Carnallite has a higher to value and, therefore, a different structure.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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