Fehlordnung bei Smectiten in Abhängigkeit vom Zwischenschichtkation
作者： Josef Breu , Wolfgang Seidl , Alexander Stoll
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摘要: Fluorosmectite, [M0.5]zwi[Mg2.5Li0.5]okt[Si4]tetO10F2 (M = Na, K, Rb, Cs), wurden uber eine Schmelzsynthese in gasdicht verschweisten Mo-Tiegeln dargestellt. Bei gleichbleibender, im Bereich der Smectite liegender, Schichtladung von x 0.5 nimmt sowohl die Kristallitgrose als auch Stapelordnung mit groser werdendem Zwischenschichtkation zu. Wahrend beim mikrokristallinen Na-Hectorit Rotations- (n120° und n60°) Translationsfehlordnung (±0.145b) vorliegt, findet man fur K-Hectorit dagegen nur noch ±b/3 Translationsfehlordnung. Rb- Cs-Hectorit zeigen schlieslich ein normales Bragg-Beugungsmuster. Mit Casium kann vollkommen geordnete sogar einkristalline Hectorite herstellen, keinerlei diffuse Streuung mehr Einkristallstrukturanalyse erlauben (monoklin, 1M—Polytyp, C2/m, a 5.2401(10)A, b 9.0942(10) A, c 10.7971(10)A, β 99.21 (2)°, V 507.90(12) A3, Z 2). Diese 3D geordneten besitzen immer ausreichende intrakristalline Reaktivitat, einen schnellen vollstandigen Austausch gegen Organokationen erlaubt. Disorder Smectites Dependence of the Interlayer Cation Fluorosmectites, [M0.5]inter[Mg2.5Li0.5]oct[Si4]tetO10F2 have been synthesised from melt gastight Mo crucibles. At same layer charge 0.5, which lies within range smectites, both, crystallite size and stacking order increases with interlayer cation. For microcrystalline Na-hectorite both rotational translational planar defects were identified, whereas for K-hectorite only found. Finally, Cs-hectorite show normal Bragg-type diffraction pattern. even single crystals may be found that display no scattering allow structure refinement (monoclinic, 1M-polytype, These ordered smectites still satisfactory intracrystalline reactivity cations readily exchanged organocations.
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